php-src/ext/mbstring/php_mbregex.c

/*
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Author: Tsukada Takuya <tsukada@fminn.nagano.nagano.jp>              |
   +----------------------------------------------------------------------+
 */

#include "libmbfl/config.h"

#include "php.h"
#include "php_ini.h"

#ifdef HAVE_MBREGEX

#include "zend_smart_str.h"
#include "ext/standard/info.h"
#include "php_mbregex.h"
#include "mbstring.h"
#include "libmbfl/filters/mbfilter_utf8.h"

#include "php_onig_compat.h" /* must come prior to the oniguruma header */
#include <oniguruma.h>
#undef UChar

#if !defined(ONIGURUMA_VERSION_INT) || ONIGURUMA_VERSION_INT < 60800
typedef void OnigMatchParam;
#define onig_new_match_param() (NULL)
#define onig_initialize_match_param(x) (void)(x)
#define onig_set_match_stack_limit_size_of_match_param(x, y)
#define onig_set_retry_limit_in_match_of_match_param(x, y)
#define onig_free_match_param(x)
#define onig_search_with_param(reg, str, end, start, range, region, option, mp) \
		onig_search(reg, str, end, start, range, region, option)
#define onig_match_with_param(re, str, end, at, region, option, mp) \
		onig_match(re, str, end, at, region, option)
#endif

ZEND_EXTERN_MODULE_GLOBALS(mbstring)

char php_mb_oniguruma_version[256];

struct _zend_mb_regex_globals {
	OnigEncoding default_mbctype;
	OnigEncoding current_mbctype;
	const mbfl_encoding *current_mbctype_mbfl_encoding;
	HashTable ht_rc;
	zval search_str;
	zval *search_str_val;
	size_t search_pos;
	php_mb_regex_t *search_re;
	OnigRegion *search_regs;
	OnigOptionType regex_default_options;
	OnigSyntaxType *regex_default_syntax;
};

#define MBREX(g) (MBSTRG(mb_regex_globals)->g)

/* {{{ static void php_mb_regex_free_cache() */
static void php_mb_regex_free_cache(zval *el) {
	onig_free((php_mb_regex_t *)Z_PTR_P(el));
}
/* }}} */

/* {{{ _php_mb_regex_globals_ctor */
static int _php_mb_regex_globals_ctor(zend_mb_regex_globals *pglobals)
{
	pglobals->default_mbctype = ONIG_ENCODING_UTF8;
	pglobals->current_mbctype = ONIG_ENCODING_UTF8;
	pglobals->current_mbctype_mbfl_encoding = &mbfl_encoding_utf8;
	ZVAL_UNDEF(&pglobals->search_str);
	pglobals->search_re = (php_mb_regex_t*)NULL;
	pglobals->search_pos = 0;
	pglobals->search_regs = (OnigRegion*)NULL;
	pglobals->regex_default_options = ONIG_OPTION_MULTILINE | ONIG_OPTION_SINGLELINE;
	pglobals->regex_default_syntax = ONIG_SYNTAX_RUBY;
	return SUCCESS;
}
/* }}} */

/* {{{ php_mb_regex_globals_alloc */
zend_mb_regex_globals *php_mb_regex_globals_alloc(void)
{
	zend_mb_regex_globals *pglobals = pemalloc(
			sizeof(zend_mb_regex_globals), 1);
	if (SUCCESS != _php_mb_regex_globals_ctor(pglobals)) {
		pefree(pglobals, 1);
		return NULL;
	}
	return pglobals;
}
/* }}} */

/* {{{ php_mb_regex_globals_free */
void php_mb_regex_globals_free(zend_mb_regex_globals *pglobals)
{
	if (!pglobals) {
		return;
	}
	pefree(pglobals, 1);
}
/* }}} */

/* {{{ PHP_MINIT_FUNCTION(mb_regex) */
PHP_MINIT_FUNCTION(mb_regex)
{
	onig_init();

	snprintf(php_mb_oniguruma_version, sizeof(php_mb_oniguruma_version), "%d.%d.%d",
		ONIGURUMA_VERSION_MAJOR, ONIGURUMA_VERSION_MINOR, ONIGURUMA_VERSION_TEENY);

	return SUCCESS;
}
/* }}} */

/* {{{ PHP_MSHUTDOWN_FUNCTION(mb_regex) */
PHP_MSHUTDOWN_FUNCTION(mb_regex)
{
	onig_end();
	return SUCCESS;
}
/* }}} */

/* {{{ PHP_RINIT_FUNCTION(mb_regex) */
PHP_RINIT_FUNCTION(mb_regex)
{
	if (!MBSTRG(mb_regex_globals)) return FAILURE;
	zend_hash_init(&MBREX(ht_rc), 0, NULL, php_mb_regex_free_cache, 0);
	return SUCCESS;
}
/* }}} */

/* {{{ PHP_RSHUTDOWN_FUNCTION(mb_regex) */
PHP_RSHUTDOWN_FUNCTION(mb_regex)
{
	MBREX(current_mbctype) = MBREX(default_mbctype);
	MBREX(current_mbctype_mbfl_encoding) = mbfl_name2encoding(php_mb_regex_get_default_mbctype());

	if (!Z_ISUNDEF(MBREX(search_str))) {
		zval_ptr_dtor(&MBREX(search_str));
		ZVAL_UNDEF(&MBREX(search_str));
	}
	MBREX(search_pos) = 0;
	MBREX(search_re) = NULL;

	if (MBREX(search_regs) != NULL) {
		onig_region_free(MBREX(search_regs), 1);
		MBREX(search_regs) = (OnigRegion *)NULL;
	}
	zend_hash_destroy(&MBREX(ht_rc));

	return SUCCESS;
}
/* }}} */

/* {{{ PHP_MINFO_FUNCTION(mb_regex) */
PHP_MINFO_FUNCTION(mb_regex)
{
	char buf[32];
	php_info_print_table_start();
	php_info_print_table_row(2, "Multibyte (japanese) regex support", "enabled");
	snprintf(buf, sizeof(buf), "%d.%d.%d",
			ONIGURUMA_VERSION_MAJOR,
			ONIGURUMA_VERSION_MINOR,
			ONIGURUMA_VERSION_TEENY);
	php_info_print_table_row(2, "Multibyte regex (oniguruma) version", buf);
	php_info_print_table_end();
}
/* }}} */

/*
 * encoding name resolver
 */

/* {{{ encoding name map */
typedef struct _php_mb_regex_enc_name_map_t {
	const char *names;
	OnigEncoding code;
} php_mb_regex_enc_name_map_t;

static const php_mb_regex_enc_name_map_t enc_name_map[] = {
#ifdef ONIG_ENCODING_EUC_JP
	{
		"EUC-JP\0EUCJP\0X-EUC-JP\0UJIS\0EUCJP\0EUCJP-WIN\0",
		ONIG_ENCODING_EUC_JP
	},
#endif
#ifdef ONIG_ENCODING_UTF8
	{
		"UTF-8\0UTF8\0",
		ONIG_ENCODING_UTF8
	},
#endif
#ifdef ONIG_ENCODING_UTF16_BE
	{
		"UTF-16\0UTF-16BE\0",
		ONIG_ENCODING_UTF16_BE
	},
#endif
#ifdef ONIG_ENCODING_UTF16_LE
	{
		"UTF-16LE\0",
		ONIG_ENCODING_UTF16_LE
	},
#endif
#ifdef ONIG_ENCODING_UTF32_BE
	{
		"UCS-4\0UTF-32\0UTF-32BE\0",
		ONIG_ENCODING_UTF32_BE
	},
#endif
#ifdef ONIG_ENCODING_UTF32_LE
	{
		"UCS-4LE\0UTF-32LE\0",
		ONIG_ENCODING_UTF32_LE
	},
#endif
#ifdef ONIG_ENCODING_SJIS
	{
		"SJIS\0CP932\0MS932\0SHIFT_JIS\0SJIS-WIN\0WINDOWS-31J\0",
		ONIG_ENCODING_SJIS
	},
#endif
#ifdef ONIG_ENCODING_BIG5
	{
		"BIG5\0BIG-5\0BIGFIVE\0CN-BIG5\0BIG-FIVE\0",
		ONIG_ENCODING_BIG5
	},
#endif
#ifdef ONIG_ENCODING_EUC_CN
	{
		"EUC-CN\0EUCCN\0EUC_CN\0GB-2312\0GB2312\0",
		ONIG_ENCODING_EUC_CN
	},
#endif
#ifdef ONIG_ENCODING_EUC_TW
	{
		"EUC-TW\0EUCTW\0EUC_TW\0",
		ONIG_ENCODING_EUC_TW
	},
#endif
#ifdef ONIG_ENCODING_EUC_KR
	{
		"EUC-KR\0EUCKR\0EUC_KR\0",
		ONIG_ENCODING_EUC_KR
	},
#endif
#if defined(ONIG_ENCODING_KOI8) && !PHP_ONIG_BAD_KOI8_ENTRY
	{
		"KOI8\0KOI-8\0",
		ONIG_ENCODING_KOI8
	},
#endif
#ifdef ONIG_ENCODING_KOI8_R
	{
		"KOI8R\0KOI8-R\0KOI-8R\0",
		ONIG_ENCODING_KOI8_R
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_1
	{
		"ISO-8859-1\0ISO8859-1\0",
		ONIG_ENCODING_ISO_8859_1
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_2
	{
		"ISO-8859-2\0ISO8859-2\0",
		ONIG_ENCODING_ISO_8859_2
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_3
	{
		"ISO-8859-3\0ISO8859-3\0",
		ONIG_ENCODING_ISO_8859_3
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_4
	{
		"ISO-8859-4\0ISO8859-4\0",
		ONIG_ENCODING_ISO_8859_4
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_5
	{
		"ISO-8859-5\0ISO8859-5\0",
		ONIG_ENCODING_ISO_8859_5
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_6
	{
		"ISO-8859-6\0ISO8859-6\0",
		ONIG_ENCODING_ISO_8859_6
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_7
	{
		"ISO-8859-7\0ISO8859-7\0",
		ONIG_ENCODING_ISO_8859_7
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_8
	{
		"ISO-8859-8\0ISO8859-8\0",
		ONIG_ENCODING_ISO_8859_8
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_9
	{
		"ISO-8859-9\0ISO8859-9\0",
		ONIG_ENCODING_ISO_8859_9
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_10
	{
		"ISO-8859-10\0ISO8859-10\0",
		ONIG_ENCODING_ISO_8859_10
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_11
	{
		"ISO-8859-11\0ISO8859-11\0",
		ONIG_ENCODING_ISO_8859_11
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_13
	{
		"ISO-8859-13\0ISO8859-13\0",
		ONIG_ENCODING_ISO_8859_13
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_14
	{
		"ISO-8859-14\0ISO8859-14\0",
		ONIG_ENCODING_ISO_8859_14
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_15
	{
		"ISO-8859-15\0ISO8859-15\0",
		ONIG_ENCODING_ISO_8859_15
	},
#endif
#ifdef ONIG_ENCODING_ISO_8859_16
	{
		"ISO-8859-16\0ISO8859-16\0",
		ONIG_ENCODING_ISO_8859_16
	},
#endif
#ifdef ONIG_ENCODING_ASCII
	{
		"ASCII\0US-ASCII\0US_ASCII\0ISO646\0",
		ONIG_ENCODING_ASCII
	},
#endif
	{ NULL, ONIG_ENCODING_UNDEF }
};
/* }}} */

/* {{{ php_mb_regex_name2mbctype */
static OnigEncoding _php_mb_regex_name2mbctype(const char *pname)
{
	const char *p;
	const php_mb_regex_enc_name_map_t *mapping;

	if (pname == NULL || !*pname) {
		return ONIG_ENCODING_UNDEF;
	}

	for (mapping = enc_name_map; mapping->names != NULL; mapping++) {
		for (p = mapping->names; *p != '\0'; p += (strlen(p) + 1)) {
			if (strcasecmp(p, pname) == 0) {
				return mapping->code;
			}
		}
	}

	return ONIG_ENCODING_UNDEF;
}
/* }}} */

/* {{{ php_mb_regex_mbctype2name */
static const char *_php_mb_regex_mbctype2name(OnigEncoding mbctype)
{
	const php_mb_regex_enc_name_map_t *mapping;

	for (mapping = enc_name_map; mapping->names != NULL; mapping++) {
		if (mapping->code == mbctype) {
			return mapping->names;
		}
	}

	return NULL;
}
/* }}} */

/* {{{ php_mb_regex_set_mbctype */
int php_mb_regex_set_mbctype(const char *encname)
{
	OnigEncoding mbctype = _php_mb_regex_name2mbctype(encname);
	if (mbctype == ONIG_ENCODING_UNDEF) {
		return FAILURE;
	}
	MBREX(current_mbctype) = mbctype;
	MBREX(current_mbctype_mbfl_encoding) = mbfl_name2encoding(encname);
	return SUCCESS;
}
/* }}} */

/* {{{ php_mb_regex_set_default_mbctype */
int php_mb_regex_set_default_mbctype(const char *encname)
{
	OnigEncoding mbctype = _php_mb_regex_name2mbctype(encname);
	if (mbctype == ONIG_ENCODING_UNDEF) {
		return FAILURE;
	}
	MBREX(default_mbctype) = mbctype;
	return SUCCESS;
}
/* }}} */

/* {{{ php_mb_regex_get_mbctype */
const char *php_mb_regex_get_mbctype(void)
{
	return _php_mb_regex_mbctype2name(MBREX(current_mbctype));
}
/* }}} */

/* {{{ php_mb_regex_get_mbctype_encoding */
const mbfl_encoding *php_mb_regex_get_mbctype_encoding(void)
{
	return MBREX(current_mbctype_mbfl_encoding);
}
/* }}} */

/* {{{ php_mb_regex_get_default_mbctype */
const char *php_mb_regex_get_default_mbctype(void)
{
	return _php_mb_regex_mbctype2name(MBREX(default_mbctype));
}
/* }}} */

/*
 * regex cache
 */
/* {{{ php_mbregex_compile_pattern */
static php_mb_regex_t *php_mbregex_compile_pattern(const char *pattern, size_t patlen, OnigOptionType options, OnigSyntaxType *syntax)
{
	int err_code = 0;
	php_mb_regex_t *retval = NULL, *rc = NULL;
	OnigErrorInfo err_info;
	OnigUChar err_str[ONIG_MAX_ERROR_MESSAGE_LEN];
	OnigEncoding enc = MBREX(current_mbctype);

	if (!php_mb_check_encoding(pattern, patlen, php_mb_regex_get_mbctype_encoding())) {
		php_error_docref(NULL, E_WARNING,
			"Pattern is not valid under %s encoding", _php_mb_regex_mbctype2name(enc));
		return NULL;
	}

	rc = zend_hash_str_find_ptr(&MBREX(ht_rc), (char *)pattern, patlen);
	if (!rc || onig_get_options(rc) != options || onig_get_encoding(rc) != enc || onig_get_syntax(rc) != syntax) {
		if ((err_code = onig_new(&retval, (OnigUChar *)pattern, (OnigUChar *)(pattern + patlen), options, enc, syntax, &err_info)) != ONIG_NORMAL) {
			onig_error_code_to_str(err_str, err_code, &err_info);
			php_error_docref(NULL, E_WARNING, "mbregex compile err: %s", err_str);
			return NULL;
		}
		if (rc == MBREX(search_re)) {
			/* reuse the new rc? see bug #72399 */
			MBREX(search_re) = NULL;
		}
		zend_hash_str_update_ptr(&MBREX(ht_rc), (char *)pattern, patlen, retval);
	} else {
		retval = rc;
	}
	return retval;
}
/* }}} */

/* {{{ _php_mb_regex_get_option_string */
static size_t _php_mb_regex_get_option_string(char *str, size_t len, OnigOptionType option, OnigSyntaxType *syntax)
{
	size_t len_left = len;
	size_t len_req = 0;
	char *p = str;
	char c;

	if ((option & ONIG_OPTION_IGNORECASE) != 0) {
		if (len_left > 0) {
			--len_left;
			*(p++) = 'i';
		}
		++len_req;
	}

	if ((option & ONIG_OPTION_EXTEND) != 0) {
		if (len_left > 0) {
			--len_left;
			*(p++) = 'x';
		}
		++len_req;
	}

	if ((option & (ONIG_OPTION_MULTILINE | ONIG_OPTION_SINGLELINE)) ==
			(ONIG_OPTION_MULTILINE | ONIG_OPTION_SINGLELINE)) {
		if (len_left > 0) {
			--len_left;
			*(p++) = 'p';
		}
		++len_req;
	} else {
		if ((option & ONIG_OPTION_MULTILINE) != 0) {
			if (len_left > 0) {
				--len_left;
				*(p++) = 'm';
			}
			++len_req;
		}

		if ((option & ONIG_OPTION_SINGLELINE) != 0) {
			if (len_left > 0) {
				--len_left;
				*(p++) = 's';
			}
			++len_req;
		}
	}
	if ((option & ONIG_OPTION_FIND_LONGEST) != 0) {
		if (len_left > 0) {
			--len_left;
			*(p++) = 'l';
		}
		++len_req;
	}
	if ((option & ONIG_OPTION_FIND_NOT_EMPTY) != 0) {
		if (len_left > 0) {
			--len_left;
			*(p++) = 'n';
		}
		++len_req;
	}

	c = 0;

	if (syntax == ONIG_SYNTAX_JAVA) {
		c = 'j';
	} else if (syntax == ONIG_SYNTAX_GNU_REGEX) {
		c = 'u';
	} else if (syntax == ONIG_SYNTAX_GREP) {
		c = 'g';
	} else if (syntax == ONIG_SYNTAX_EMACS) {
		c = 'c';
	} else if (syntax == ONIG_SYNTAX_RUBY) {
		c = 'r';
	} else if (syntax == ONIG_SYNTAX_PERL) {
		c = 'z';
	} else if (syntax == ONIG_SYNTAX_POSIX_BASIC) {
		c = 'b';
	} else if (syntax == ONIG_SYNTAX_POSIX_EXTENDED) {
		c = 'd';
	}

	if (c != 0) {
		if (len_left > 0) {
			--len_left;
			*(p++) = c;
		}
		++len_req;
	}


	if (len_left > 0) {
		--len_left;
		*(p++) = '\0';
	}
	++len_req;
	if (len < len_req) {
		return len_req;
	}

	return 0;
}
/* }}} */

/* {{{ _php_mb_regex_init_options */
static bool _php_mb_regex_init_options(const char *parg, size_t narg, OnigOptionType *option,
	OnigSyntaxType **syntax)
{
	size_t n;
	char c;
	OnigOptionType optm = 0;

	*syntax = ONIG_SYNTAX_RUBY;

	if (parg != NULL) {
		n = 0;
		while(n < narg) {
			c = parg[n++];
			switch (c) {
				case 'i':
					optm |= ONIG_OPTION_IGNORECASE;
					break;
				case 'x':
					optm |= ONIG_OPTION_EXTEND;
					break;
				case 'm':
					optm |= ONIG_OPTION_MULTILINE;
					break;
				case 's':
					optm |= ONIG_OPTION_SINGLELINE;
					break;
				case 'p':
					optm |= ONIG_OPTION_MULTILINE | ONIG_OPTION_SINGLELINE;
					break;
				case 'l':
					optm |= ONIG_OPTION_FIND_LONGEST;
					break;
				case 'n':
					optm |= ONIG_OPTION_FIND_NOT_EMPTY;
					break;
				case 'j':
					*syntax = ONIG_SYNTAX_JAVA;
					break;
				case 'u':
					*syntax = ONIG_SYNTAX_GNU_REGEX;
					break;
				case 'g':
					*syntax = ONIG_SYNTAX_GREP;
					break;
				case 'c':
					*syntax = ONIG_SYNTAX_EMACS;
					break;
				case 'r':
					*syntax = ONIG_SYNTAX_RUBY;
					break;
				case 'z':
					*syntax = ONIG_SYNTAX_PERL;
					break;
				case 'b':
					*syntax = ONIG_SYNTAX_POSIX_BASIC;
					break;
				case 'd':
					*syntax = ONIG_SYNTAX_POSIX_EXTENDED;
					break;
				default:
					zend_value_error("Option \"%c\" is not supported", c);
					return false;
			}
		}
		if (option != NULL) *option|=optm;
	}
	return true;
}
/* }}} */


/*
 * Callbacks for named subpatterns
 */

/* {{{ struct mb_ereg_groups_iter_arg */
typedef struct mb_regex_groups_iter_args {
	zval		*groups;
	char		*search_str;
	size_t		search_len;
	OnigRegion	*region;
} mb_regex_groups_iter_args;
/* }}} */

/* {{{ mb_ereg_groups_iter */
static int
mb_regex_groups_iter(const OnigUChar* name, const OnigUChar* name_end, int ngroup_num, int* group_nums, regex_t* reg, void* parg)
{
	mb_regex_groups_iter_args *args = (mb_regex_groups_iter_args *) parg;
	int gn, beg, end;

	/*
	 * In case of duplicate groups, keep only the last succeeding one
	 * to be consistent with preg_match with the PCRE_DUPNAMES option.
	 */
	gn = onig_name_to_backref_number(reg, name, name_end, args->region);
	beg = args->region->beg[gn];
	end = args->region->end[gn];
	if (beg >= 0 && beg < end && end <= args->search_len) {
		add_assoc_stringl_ex(args->groups, (char *)name, name_end - name, &args->search_str[beg], end - beg);
	} else {
		add_assoc_bool_ex(args->groups, (char *)name, name_end - name, 0);
	}

	return 0;
}
/* }}} */

/*
 * Helper for _php_mb_regex_ereg_replace_exec
 */
/* {{{ mb_regex_substitute */
static inline void mb_regex_substitute(
	smart_str *pbuf,
	const char *subject,
	size_t subject_len,
	char *replace,
	size_t replace_len,
	php_mb_regex_t *regexp,
	OnigRegion *regs,
	const mbfl_encoding *enc
) {
	char *p, *sp, *eos;
	int no; /* bakreference group number */
	int clen; /* byte-length of the current character */

	p = replace;
	eos = replace + replace_len;

	while (p < eos) {
		clen = (int) php_mb_mbchar_bytes(p, enc);
		if (clen != 1 || p == eos || p[0] != '\\') {
			/* skip anything that's not an ascii backslash */
			smart_str_appendl(pbuf, p, clen);
			p += clen;
			continue;
		}
		sp = p; /* save position */
		clen = (int) php_mb_mbchar_bytes(++p, enc);
		if (clen != 1 || p == eos) {
			/* skip backslash followed by multibyte char */
			smart_str_appendl(pbuf, sp, p - sp);
			continue;
		}
		no = -1;
		switch (p[0]) {
			case '0':
				no = 0;
				p++;
				break;
			case '1': case '2': case '3': case '4':
			case '5': case '6': case '7': case '8': case '9':
				if (!onig_noname_group_capture_is_active(regexp)) {
					/*
					 * FIXME:
					 * Oniguruma throws a compile error if numbered backrefs are used with named groups in the pattern.
					 * For now we just ignore them, but in the future we might want to raise a warning
					 * and abort the whole replace operation.
					 */
					p++;
					smart_str_appendl(pbuf, sp, p - sp);
					continue;
				}
				no = p[0] - '0';
				p++;
				break;
			case 'k':
			{
				clen = (int) php_mb_mbchar_bytes(++p, enc);
				if (clen != 1 || p == eos || (p[0] != '<' && p[0] != '\'')) {
					/* not a backref delimiter */
					p += clen;
					smart_str_appendl(pbuf, sp, p - sp);
					continue;
				}
				/* try to consume everything until next delimiter */
				char delim = p[0] == '<' ? '>' : '\'';
				char *name, *name_end;
				char maybe_num = 1;
				name_end = name = p + 1;
				while (name_end < eos) {
					clen = (int) php_mb_mbchar_bytes(name_end, enc);
					if (clen != 1) {
						name_end += clen;
						maybe_num = 0;
						continue;
					}
					if (name_end[0] == delim) break;
					if (maybe_num && !isdigit(name_end[0])) maybe_num = 0;
					name_end++;
				}
				p = name_end + 1;
				if (name_end - name < 1 || name_end >= eos) {
					/* the backref was empty or we failed to find the end delimiter */
					smart_str_appendl(pbuf, sp, p - sp);
					continue;
				}
				/* we have either a name or a number */
				if (maybe_num) {
					if (!onig_noname_group_capture_is_active(regexp)) {
						/* see above note on mixing numbered & named backrefs */
						smart_str_appendl(pbuf, sp, p - sp);
						continue;
					}
					if (name_end - name == 1) {
						no = name[0] - '0';
						break;
					}
					if (name[0] == '0') {
						/* 01 is not a valid number */
						break;
					}
					no = (int) strtoul(name, NULL, 10);
					break;
				}
				no = onig_name_to_backref_number(regexp, (OnigUChar *)name, (OnigUChar *)name_end, regs);
				break;
			}
			default:
				/* We're not treating \ as an escape character and will interpret something like
				 * \\1 as \ followed by \1, rather than \\ followed by 1. This is because this
				 * function has not supported escaping of backslashes historically. */
				smart_str_appendl(pbuf, sp, p - sp);
				continue;
		}
		if (no < 0 || no >= regs->num_regs) {
			/* invalid group number reference, keep the escape sequence in the output */
			smart_str_appendl(pbuf, sp, p - sp);
			continue;
		}
		if (regs->beg[no] >= 0 && regs->beg[no] < regs->end[no] && (size_t)regs->end[no] <= subject_len) {
			smart_str_appendl(pbuf, subject + regs->beg[no], regs->end[no] - regs->beg[no]);
		}
	}

	if (p < eos) {
		smart_str_appendl(pbuf, p, eos - p);
	}
}
/* }}} */

/*
 * php functions
 */

/* {{{ Returns the current encoding for regex as a string. */
PHP_FUNCTION(mb_regex_encoding)
{
	char *encoding = NULL;
	size_t encoding_len;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s!", &encoding, &encoding_len) == FAILURE) {
		RETURN_THROWS();
	}

	if (!encoding) {
		const char *retval = php_mb_regex_get_mbctype();
		ZEND_ASSERT(retval != NULL);

		RETURN_STRING(retval);
	} else {
		if (php_mb_regex_set_mbctype(encoding) == FAILURE) {
			zend_argument_value_error(1, "must be a valid encoding, \"%s\" given", encoding);
			RETURN_THROWS();
		}

		/* TODO Make function return previous encoding? */
		RETURN_TRUE;
	}
}
/* }}} */

/* {{{ _php_mb_onig_search */
static int _php_mb_onig_search(regex_t* reg, const OnigUChar* str, const OnigUChar* end, const OnigUChar* start,
                   const OnigUChar* range, OnigRegion* region, OnigOptionType option) {
	OnigMatchParam *mp = onig_new_match_param();
	int err;
	onig_initialize_match_param(mp);
	if (!ZEND_LONG_UINT_OVFL(MBSTRG(regex_stack_limit))) {
		onig_set_match_stack_limit_size_of_match_param(mp, (unsigned int)MBSTRG(regex_stack_limit));
	}
	if (!ZEND_LONG_UINT_OVFL(MBSTRG(regex_retry_limit))) {
		onig_set_retry_limit_in_match_of_match_param(mp, (unsigned int)MBSTRG(regex_retry_limit));
	}
	/* search */
	err = onig_search_with_param(reg, str, end, start, range, region, option, mp);
	onig_free_match_param(mp);
	return err;
}
/* }}} */


/* {{{ _php_mb_regex_ereg_exec */
static void _php_mb_regex_ereg_exec(INTERNAL_FUNCTION_PARAMETERS, int icase)
{
	zval *array = NULL;
	char *arg_pattern, *string;
	size_t arg_pattern_len, string_len;
	php_mb_regex_t *re;
	OnigRegion *regs = NULL;
	int i, beg, end;
	OnigOptionType options;
	char *str;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|z", &arg_pattern, &arg_pattern_len, &string, &string_len, &array) == FAILURE) {
		RETURN_THROWS();
	}

	if (arg_pattern_len == 0) {
		zend_argument_value_error(1, "must not be empty");
		RETURN_THROWS();
	}

	if (array != NULL) {
		array = zend_try_array_init(array);
		if (!array) {
			RETURN_THROWS();
		}
	}

	if (!php_mb_check_encoding(
		string,
		string_len,
		php_mb_regex_get_mbctype_encoding()
	)) {
		RETURN_FALSE;
	}

	options = MBREX(regex_default_options);
	if (icase) {
		options |= ONIG_OPTION_IGNORECASE;
	}

	re = php_mbregex_compile_pattern(arg_pattern, arg_pattern_len, options, MBREX(regex_default_syntax));
	if (re == NULL) {
		RETVAL_FALSE;
		goto out;
	}

	regs = onig_region_new();

	/* actually execute the regular expression */
	if (_php_mb_onig_search(re, (OnigUChar *)string, (OnigUChar *)(string + string_len), (OnigUChar *)string, (OnigUChar *)(string + string_len), regs, 0) < 0) {
		RETVAL_FALSE;
		goto out;
	}

	str = string;
	if (array != NULL) {
		for (i = 0; i < regs->num_regs; i++) {
			beg = regs->beg[i];
			end = regs->end[i];
			if (beg >= 0 && beg < end && (size_t)end <= string_len) {
				add_index_stringl(array, i, (char *)&str[beg], end - beg);
			} else {
				add_index_bool(array, i, 0);
			}
		}

		if (onig_number_of_names(re) > 0) {
			mb_regex_groups_iter_args args = {array, string, string_len, regs};
			onig_foreach_name(re, mb_regex_groups_iter, &args);
		}
	}

	RETVAL_TRUE;
out:
	if (regs != NULL) {
		onig_region_free(regs, 1);
	}
}
/* }}} */

/* {{{ Regular expression match for multibyte string */
PHP_FUNCTION(mb_ereg)
{
	_php_mb_regex_ereg_exec(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */

/* {{{ Case-insensitive regular expression match for multibyte string */
PHP_FUNCTION(mb_eregi)
{
	_php_mb_regex_ereg_exec(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */

/* {{{ _php_mb_regex_ereg_replace_exec */
static void _php_mb_regex_ereg_replace_exec(INTERNAL_FUNCTION_PARAMETERS, OnigOptionType options, int is_callable)
{
	char *arg_pattern;
	size_t arg_pattern_len;

	char *replace;
	size_t replace_len;

	zend_fcall_info arg_replace_fci;
	zend_fcall_info_cache arg_replace_fci_cache;

	char *string;
	size_t string_len;

	php_mb_regex_t *re;
	OnigSyntaxType *syntax;
	OnigRegion *regs = NULL;
	smart_str out_buf = {0};
	smart_str eval_buf = {0};
	smart_str *pbuf;
	int err, n;
	OnigUChar *pos;
	OnigUChar *string_lim;
	char *description = NULL;

	const mbfl_encoding *enc = php_mb_regex_get_mbctype_encoding();
	ZEND_ASSERT(enc != NULL);

	{
		char *option_str = NULL;
		size_t option_str_len = 0;

		if (!is_callable) {
			if (zend_parse_parameters(ZEND_NUM_ARGS(), "sss|s!",
						&arg_pattern, &arg_pattern_len,
						&replace, &replace_len,
						&string, &string_len,
						&option_str, &option_str_len) == FAILURE) {
				RETURN_THROWS();
			}
		} else {
			if (zend_parse_parameters(ZEND_NUM_ARGS(), "sfs|s!",
						&arg_pattern, &arg_pattern_len,
						&arg_replace_fci, &arg_replace_fci_cache,
						&string, &string_len,
						&option_str, &option_str_len) == FAILURE) {
				RETURN_THROWS();
			}
		}

		if (!php_mb_check_encoding(string, string_len, enc)) {
			RETURN_NULL();
		}

		if (option_str != NULL) {
			/* Initialize option and in case of failure it means there is a value error */
			if (!_php_mb_regex_init_options(option_str, option_str_len, &options, &syntax)) {
				RETURN_THROWS();
			}
		} else {
			options |= MBREX(regex_default_options);
			syntax = MBREX(regex_default_syntax);
		}
	}

	/* create regex pattern buffer */
	re = php_mbregex_compile_pattern(arg_pattern, arg_pattern_len, options, syntax);
	if (re == NULL) {
		RETURN_FALSE;
	}

	if (is_callable) {
		pbuf = &eval_buf;
		description = zend_make_compiled_string_description("mbregex replace");
	} else {
		pbuf = &out_buf;
		description = NULL;
	}

	/* do the actual work */
	err = 0;
	pos = (OnigUChar *)string;
	string_lim = (OnigUChar*)(string + string_len);
	regs = onig_region_new();
	while (err >= 0) {
		err = _php_mb_onig_search(re, (OnigUChar *)string, (OnigUChar *)string_lim, pos, (OnigUChar *)string_lim, regs, 0);
		if (err <= -2) {
			OnigUChar err_str[ONIG_MAX_ERROR_MESSAGE_LEN];
			onig_error_code_to_str(err_str, err);
			php_error_docref(NULL, E_WARNING, "mbregex search failure in php_mbereg_replace_exec(): %s", err_str);
			break;
		}
		if (err >= 0) {
			/* copy the part of the string before the match */
			smart_str_appendl(&out_buf, (char *)pos, (size_t)((OnigUChar *)(string + regs->beg[0]) - pos));

			if (!is_callable) {
				mb_regex_substitute(pbuf, string, string_len, replace, replace_len, re, regs, enc);
			}

			if (is_callable) {
				zval args[1];
				zval subpats, retval;
				int i;

				array_init(&subpats);
				for (i = 0; i < regs->num_regs; i++) {
					add_next_index_stringl(&subpats, string + regs->beg[i], regs->end[i] - regs->beg[i]);
				}
				if (onig_number_of_names(re) > 0) {
					mb_regex_groups_iter_args args = {&subpats, string, string_len, regs};
					onig_foreach_name(re, mb_regex_groups_iter, &args);
				}

				ZVAL_COPY_VALUE(&args[0], &subpats);
				/* null terminate buffer */
				smart_str_0(&eval_buf);

				arg_replace_fci.param_count = 1;
				arg_replace_fci.params = args;
				arg_replace_fci.retval = &retval;
				if (zend_call_function(&arg_replace_fci, &arg_replace_fci_cache) == SUCCESS &&
						!Z_ISUNDEF(retval)) {
					convert_to_string(&retval);
					smart_str_appendl(&out_buf, Z_STRVAL(retval), Z_STRLEN(retval));
					smart_str_free(&eval_buf);
					zval_ptr_dtor(&retval);
				} else {
					if (!EG(exception)) {
						zend_throw_error(NULL, "Unable to call custom replacement function");
						zval_ptr_dtor(&subpats);
						RETURN_THROWS();
					}
				}
				zval_ptr_dtor(&subpats);
			}

			n = regs->end[0];
			if ((pos - (OnigUChar *)string) < n) {
				pos = (OnigUChar *)string + n;
			} else {
				if (pos < string_lim) {
					smart_str_appendl(&out_buf, (char *)pos, 1);
				}
				pos++;
			}
		} else { /* nomatch */
			/* stick that last bit of string on our output */
			if (string_lim - pos > 0) {
				smart_str_appendl(&out_buf, (char *)pos, string_lim - pos);
			}
		}
		onig_region_free(regs, 0);
	}

	if (description) {
		efree(description);
	}
	if (regs != NULL) {
		onig_region_free(regs, 1);
	}
	smart_str_free(&eval_buf);

	if (err <= -2) {
		smart_str_free(&out_buf);
		RETURN_FALSE;
	}

	RETURN_STR(smart_str_extract(&out_buf));
}
/* }}} */

/* {{{ Replace regular expression for multibyte string */
PHP_FUNCTION(mb_ereg_replace)
{
	_php_mb_regex_ereg_replace_exec(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0, 0);
}
/* }}} */

/* {{{ Case insensitive replace regular expression for multibyte string */
PHP_FUNCTION(mb_eregi_replace)
{
	_php_mb_regex_ereg_replace_exec(INTERNAL_FUNCTION_PARAM_PASSTHRU, ONIG_OPTION_IGNORECASE, 0);
}
/* }}} */

/* {{{ regular expression for multibyte string using replacement callback */
PHP_FUNCTION(mb_ereg_replace_callback)
{
	_php_mb_regex_ereg_replace_exec(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0, 1);
}
/* }}} */

/* {{{ split multibyte string into array by regular expression */
PHP_FUNCTION(mb_split)
{
	char *arg_pattern;
	size_t arg_pattern_len;
	php_mb_regex_t *re;
	OnigRegion *regs = NULL;
	char *string;
	OnigUChar *pos, *chunk_pos;
	size_t string_len;

	int err;
	zend_long count = -1;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|l", &arg_pattern, &arg_pattern_len, &string, &string_len, &count) == FAILURE) {
		RETURN_THROWS();
	}

	if (count > 0) {
		count--;
	}

	if (!php_mb_check_encoding(string, string_len, php_mb_regex_get_mbctype_encoding())) {
		RETURN_FALSE;
	}

	/* create regex pattern buffer */
	if ((re = php_mbregex_compile_pattern(arg_pattern, arg_pattern_len, MBREX(regex_default_options), MBREX(regex_default_syntax))) == NULL) {
		RETURN_FALSE;
	}

	array_init(return_value);

	chunk_pos = pos = (OnigUChar *)string;
	err = 0;
	regs = onig_region_new();
	/* churn through str, generating array entries as we go */
	while (count != 0 && (size_t)(pos - (OnigUChar *)string) < string_len) {
		size_t beg, end;
		err = _php_mb_onig_search(re, (OnigUChar *)string, (OnigUChar *)(string + string_len), pos, (OnigUChar *)(string + string_len), regs, 0);
		if (err < 0) {
			break;
		}
		beg = regs->beg[0], end = regs->end[0];
		/* add it to the array */
		if ((size_t)(pos - (OnigUChar *)string) < end) {
			if (beg < string_len && beg >= (size_t)(chunk_pos - (OnigUChar *)string)) {
				add_next_index_stringl(return_value, (char *)chunk_pos, ((OnigUChar *)(string + beg) - chunk_pos));
				--count;
			} else {
				err = -2;
				break;
			}
			/* point at our new starting point */
			chunk_pos = pos = (OnigUChar *)string + end;
		} else {
			pos++;
		}
		onig_region_free(regs, 0);
	}

	onig_region_free(regs, 1);

	/* see if we encountered an error */
	// ToDo investigate if this can actually/should happen ...
	if (err <= -2) {
		OnigUChar err_str[ONIG_MAX_ERROR_MESSAGE_LEN];
		onig_error_code_to_str(err_str, err);
		php_error_docref(NULL, E_WARNING, "mbregex search failure in mbsplit(): %s", err_str);
		zend_array_destroy(Z_ARR_P(return_value));
		RETURN_FALSE;
	}

	/* otherwise we just have one last element to add to the array */
	if ((OnigUChar *)(string + string_len) > chunk_pos) {
		size_t n = ((OnigUChar *)(string + string_len) - chunk_pos);
		add_next_index_stringl(return_value, (char *)chunk_pos, n);
	} else {
		add_next_index_stringl(return_value, "", 0);
	}
}
/* }}} */

/* {{{ Regular expression match for multibyte string */
PHP_FUNCTION(mb_ereg_match)
{
	char *arg_pattern;
	size_t arg_pattern_len;

	char *string;
	size_t string_len;

	php_mb_regex_t *re;
	OnigSyntaxType *syntax;
	OnigOptionType option = 0;
	int err;
	OnigMatchParam *mp;

	{
		char *option_str = NULL;
		size_t option_str_len = 0;

		if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|s!",
		                          &arg_pattern, &arg_pattern_len, &string, &string_len,
		                          &option_str, &option_str_len)==FAILURE) {
			RETURN_THROWS();
		}

		if (option_str != NULL) {
			if(!_php_mb_regex_init_options(option_str, option_str_len, &option, &syntax)) {
				RETURN_THROWS();
			}
		} else {
			option |= MBREX(regex_default_options);
			syntax = MBREX(regex_default_syntax);
		}
	}

	if (!php_mb_check_encoding(string, string_len, php_mb_regex_get_mbctype_encoding())) {
		RETURN_FALSE;
	}

	if ((re = php_mbregex_compile_pattern(arg_pattern, arg_pattern_len, option, syntax)) == NULL) {
		RETURN_FALSE;
	}

	mp = onig_new_match_param();
	onig_initialize_match_param(mp);
	if (MBSTRG(regex_stack_limit) > 0 && MBSTRG(regex_stack_limit) < UINT_MAX) {
		onig_set_match_stack_limit_size_of_match_param(mp, (unsigned int)MBSTRG(regex_stack_limit));
	}
	if (MBSTRG(regex_retry_limit) > 0 && MBSTRG(regex_retry_limit) < UINT_MAX) {
		onig_set_retry_limit_in_match_of_match_param(mp, (unsigned int)MBSTRG(regex_retry_limit));
	}
	/* match */
	err = onig_match_with_param(re, (OnigUChar *)string, (OnigUChar *)(string + string_len), (OnigUChar *)string, NULL, 0, mp);
	onig_free_match_param(mp);
	if (err >= 0) {
		RETVAL_TRUE;
	} else {
		RETVAL_FALSE;
	}
}
/* }}} */

/* regex search */
/* {{{ _php_mb_regex_ereg_search_exec */
static void _php_mb_regex_ereg_search_exec(INTERNAL_FUNCTION_PARAMETERS, int mode)
{
	char *arg_pattern = NULL, *arg_options = NULL;
	size_t arg_pattern_len, arg_options_len;
	int err;
	size_t n, i, pos, len;
	/* Stored as int* in the OnigRegion struct */
	int beg, end;
	OnigOptionType option = 0;
	OnigUChar *str;
	OnigSyntaxType *syntax;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s!s!", &arg_pattern, &arg_pattern_len, &arg_options, &arg_options_len) == FAILURE) {
		RETURN_THROWS();
	}

	if (arg_options) {
		_php_mb_regex_init_options(arg_options, arg_options_len, &option, &syntax);
	} else {
		option |= MBREX(regex_default_options);
		syntax = MBREX(regex_default_syntax);
	}

	if (MBREX(search_regs)) {
		onig_region_free(MBREX(search_regs), 1);
		MBREX(search_regs) = NULL;
	}

	if (arg_pattern) {
		/* create regex pattern buffer */
		if ((MBREX(search_re) = php_mbregex_compile_pattern(arg_pattern, arg_pattern_len, option, syntax)) == NULL) {
			RETURN_FALSE;
		}
	}

	pos = MBREX(search_pos);
	str = NULL;
	len = 0;
	if (!Z_ISUNDEF(MBREX(search_str)) && Z_TYPE(MBREX(search_str)) == IS_STRING){
		str = (OnigUChar *)Z_STRVAL(MBREX(search_str));
		len = Z_STRLEN(MBREX(search_str));
	}

	if (MBREX(search_re) == NULL) {
		zend_throw_error(NULL, "No pattern was provided");
		RETURN_THROWS();
	}

	if (str == NULL) {
		zend_throw_error(NULL, "No string was provided");
		RETURN_THROWS();
	}

	MBREX(search_regs) = onig_region_new();

	err = _php_mb_onig_search(MBREX(search_re), str, str + len, str + pos, str  + len, MBREX(search_regs), 0);
	if (err == ONIG_MISMATCH) {
		MBREX(search_pos) = len;
		RETVAL_FALSE;
	} else if (err <= -2) {
		OnigUChar err_str[ONIG_MAX_ERROR_MESSAGE_LEN];
		onig_error_code_to_str(err_str, err);
		php_error_docref(NULL, E_WARNING, "mbregex search failure in mbregex_search(): %s", err_str);
		RETVAL_FALSE;
	} else {
		switch (mode) {
		case 1:
			array_init(return_value);
			beg = MBREX(search_regs)->beg[0];
			end = MBREX(search_regs)->end[0];
			add_next_index_long(return_value, beg);
			add_next_index_long(return_value, end - beg);
			break;
		case 2:
			array_init(return_value);
			n = MBREX(search_regs)->num_regs;
			for (i = 0; i < n; i++) {
				beg = MBREX(search_regs)->beg[i];
				end = MBREX(search_regs)->end[i];
				if (beg >= 0 && beg <= end && end <= len) {
					add_index_stringl(return_value, i, (char *)&str[beg], end - beg);
				} else {
					add_index_bool(return_value, i, 0);
				}
			}
			if (onig_number_of_names(MBREX(search_re)) > 0) {
				mb_regex_groups_iter_args args = {
					return_value,
					Z_STRVAL(MBREX(search_str)),
					Z_STRLEN(MBREX(search_str)),
					MBREX(search_regs)
				};
				onig_foreach_name(MBREX(search_re), mb_regex_groups_iter, &args);
			}
			break;
		default:
			RETVAL_TRUE;
			break;
		}
		end = MBREX(search_regs)->end[0];
		if (pos <= end) {
			MBREX(search_pos) = end;
		} else {
			MBREX(search_pos) = pos + 1;
		}
	}

	if (err < 0) {
		onig_region_free(MBREX(search_regs), 1);
		MBREX(search_regs) = (OnigRegion *)NULL;
	}
}
/* }}} */

/* {{{ Regular expression search for multibyte string */
PHP_FUNCTION(mb_ereg_search)
{
	_php_mb_regex_ereg_search_exec(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */

/* {{{ Regular expression search for multibyte string */
PHP_FUNCTION(mb_ereg_search_pos)
{
	_php_mb_regex_ereg_search_exec(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */

/* {{{ Regular expression search for multibyte string */
PHP_FUNCTION(mb_ereg_search_regs)
{
	_php_mb_regex_ereg_search_exec(INTERNAL_FUNCTION_PARAM_PASSTHRU, 2);
}
/* }}} */

/* {{{ Initialize string and regular expression for search. */
PHP_FUNCTION(mb_ereg_search_init)
{
	zend_string *arg_str;
	char *arg_pattern = NULL, *arg_options = NULL;
	size_t arg_pattern_len = 0, arg_options_len = 0;
	OnigSyntaxType *syntax = NULL;
	OnigOptionType option;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "S|s!s!", &arg_str, &arg_pattern, &arg_pattern_len, &arg_options, &arg_options_len) == FAILURE) {
		RETURN_THROWS();
	}

	if (arg_pattern && arg_pattern_len == 0) {
		zend_argument_value_error(2, "must not be empty");
		RETURN_THROWS();
	}

	if (arg_options) {
		option = 0;
		_php_mb_regex_init_options(arg_options, arg_options_len, &option, &syntax);
	} else {
		option = MBREX(regex_default_options);
		syntax = MBREX(regex_default_syntax);
	}

	if (arg_pattern) {
		/* create regex pattern buffer */
		if ((MBREX(search_re) = php_mbregex_compile_pattern(arg_pattern, arg_pattern_len, option, syntax)) == NULL) {
			RETURN_FALSE;
		}
	}

	if (!Z_ISNULL(MBREX(search_str))) {
		zval_ptr_dtor(&MBREX(search_str));
	}

	ZVAL_STR_COPY(&MBREX(search_str), arg_str);

	if (php_mb_check_encoding(ZSTR_VAL(arg_str), ZSTR_LEN(arg_str), php_mb_regex_get_mbctype_encoding())) {
		MBREX(search_pos) = 0;
		RETVAL_TRUE;
	} else {
		MBREX(search_pos) = ZSTR_LEN(arg_str);
		RETVAL_FALSE;
	}

	if (MBREX(search_regs) != NULL) {
		onig_region_free(MBREX(search_regs), 1);
		MBREX(search_regs) = NULL;
	}
}
/* }}} */

/* {{{ Get matched substring of the last time */
PHP_FUNCTION(mb_ereg_search_getregs)
{
	size_t n, i, len;
	/* Stored as int* in the OnigRegion struct */
	int beg, end;
	OnigUChar *str;

	if (zend_parse_parameters_none() == FAILURE) {
		RETURN_THROWS();
	}

	if (MBREX(search_regs) != NULL && Z_TYPE(MBREX(search_str)) == IS_STRING) {
		array_init(return_value);

		str = (OnigUChar *)Z_STRVAL(MBREX(search_str));
		len = Z_STRLEN(MBREX(search_str));
		n = MBREX(search_regs)->num_regs;
		for (i = 0; i < n; i++) {
			beg = MBREX(search_regs)->beg[i];
			end = MBREX(search_regs)->end[i];
			if (beg >= 0 && beg <= end && end <= len) {
				add_index_stringl(return_value, i, (char *)&str[beg], end - beg);
			} else {
				add_index_bool(return_value, i, 0);
			}
		}
		if (onig_number_of_names(MBREX(search_re)) > 0) {
			mb_regex_groups_iter_args args = {
				return_value,
				Z_STRVAL(MBREX(search_str)),
				len,
				MBREX(search_regs)
			};
			onig_foreach_name(MBREX(search_re), mb_regex_groups_iter, &args);
		}
	} else {
		// TODO This seems to be some logical error, promote to Error
		RETVAL_FALSE;
	}
}
/* }}} */

/* {{{ Get search start position */
PHP_FUNCTION(mb_ereg_search_getpos)
{
	if (zend_parse_parameters_none() == FAILURE) {
		RETURN_THROWS();
	}

	RETVAL_LONG(MBREX(search_pos));
}
/* }}} */

/* {{{ Set search start position */
PHP_FUNCTION(mb_ereg_search_setpos)
{
	zend_long position;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "l", &position) == FAILURE) {
		RETURN_THROWS();
	}

	/* Accept negative position if length of search string can be determined */
	if ((position < 0) && (!Z_ISUNDEF(MBREX(search_str))) && (Z_TYPE(MBREX(search_str)) == IS_STRING)) {
		position += Z_STRLEN(MBREX(search_str));
	}

	if (position < 0 || (!Z_ISUNDEF(MBREX(search_str)) && Z_TYPE(MBREX(search_str)) == IS_STRING && (size_t)position > Z_STRLEN(MBREX(search_str)))) {
		zend_argument_value_error(1, "is out of range");
		RETURN_THROWS();
	}

	MBREX(search_pos) = position;
	// TODO Return void
	RETURN_TRUE;
}
/* }}} */

/* {{{ php_mb_regex_set_options */
static void _php_mb_regex_set_options(OnigOptionType options, OnigSyntaxType *syntax, OnigOptionType *prev_options, OnigSyntaxType **prev_syntax)
{
	if (prev_options != NULL) {
		*prev_options = MBREX(regex_default_options);
	}
	if (prev_syntax != NULL) {
		*prev_syntax = MBREX(regex_default_syntax);
	}
	MBREX(regex_default_options) = options;
	MBREX(regex_default_syntax) = syntax;
}
/* }}} */

/* {{{ Set or get the default options for mbregex functions */
PHP_FUNCTION(mb_regex_set_options)
{
	OnigOptionType opt, prev_opt;
	OnigSyntaxType *syntax, *prev_syntax;
	char *string = NULL;
	size_t string_len;
	char buf[16];

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s!",
	                          &string, &string_len) == FAILURE) {
		RETURN_THROWS();
	}
	if (string != NULL) {
		opt = 0;
		syntax = NULL;
		if(!_php_mb_regex_init_options(string, string_len, &opt, &syntax)) {
			RETURN_THROWS();
		}
		_php_mb_regex_set_options(opt, syntax, &prev_opt, &prev_syntax);
		opt = prev_opt;
		syntax = prev_syntax;
	} else {
		opt = MBREX(regex_default_options);
		syntax = MBREX(regex_default_syntax);
	}
	_php_mb_regex_get_option_string(buf, sizeof(buf), opt, syntax);

	RETVAL_STRING(buf);
}
/* }}} */

#endif	/* HAVE_MBREGEX */