Refactor regex and implement UTF8 mode for GRegex

- with non-unicode byte to Private Use Area A mapping
- move all ifdefs to iregex.h file only

12 files changed, 327 insertions, 132 deletions

diff --git a/configure.ac b/configure.ac
index 3855ba4c..459d3a2d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -505,6 +505,7 @@ AM_CONDITIONAL(BUILD_IRSSIBOT, test "$want_irssibot" = "yes")
 AM_CONDITIONAL(BUILD_IRSSIFUZZER, test "$want_irssifuzzer" = "yes")
 AM_CONDITIONAL(BUILD_IRSSIPROXY, test "$want_irssiproxy" = "yes")
 AM_CONDITIONAL(HAVE_PERL, test "$want_perl" != "no")
+AM_CONDITIONAL(USE_GREGEX, test "x$want_gregex" = "xyes")
 
 # move LIBS to PROG_LIBS so they're not tried to be used when linking eg. perl libraries
 PROG_LIBS=$LIBS
diff --git a/src/core/Makefile.am b/src/core/Makefile.am
index 10bd035a..91daba3f 100644
--- a/src/core/Makefile.am
+++ b/src/core/Makefile.am
@@ -7,6 +7,12 @@ AM_CPPFLAGS = \
 	-DSYSCONFDIR=\""$(sysconfdir)"\" \
 	-DMODULEDIR=\""$(libdir)/irssi/modules"\"
 
+if USE_GREGEX
+regex_impl=iregex-gregex.c
+else
+regex_impl=iregex-regexh.c
+endif
+
 libcore_a_SOURCES = \
 	args.c \
 	channels.c \
@@ -45,6 +51,7 @@ libcore_a_SOURCES = \
 	signals.c \
 	special-vars.c \
 	utf8.c \
+	$(regex_impl) \
 	wcwidth.c \
 	tls.c \
 	write-buffer.c
@@ -97,6 +104,7 @@ pkginc_core_HEADERS = \
 	signals.h \
 	special-vars.h \
 	utf8.h \
+	iregex.h \
 	window-item-def.h \
 	tls.h \
 	write-buffer.h \
diff --git a/src/core/ignore.c b/src/core/ignore.c
index d4a92e3c..63a507f5 100644
--- a/src/core/ignore.c
+++ b/src/core/ignore.c
@@ -24,6 +24,7 @@
 #include "levels.h"
 #include "lib-config/iconfig.h"
 #include "settings.h"
+#include "iregex.h"
 
 #include "masks.h"
 #include "servers.h"
@@ -67,13 +68,8 @@ static int ignore_match_pattern(IGNORE_REC *rec, const char *text)
 		return FALSE;
 
 	if (rec->regexp) {
-#ifdef USE_GREGEX
 		return rec->preg != NULL &&
-			g_regex_match(rec->preg, text, 0, NULL);
-#else
-		return rec->regexp_compiled &&
-			regexec(&rec->preg, text, 0, NULL, 0) == 0;
-#endif
+			i_regex_match(rec->preg, text, 0, NULL, NULL);
 	}
 
 	return rec->fullword ?
@@ -327,41 +323,19 @@ static void ignore_remove_config(IGNORE_REC *rec)
 
 static void ignore_init_rec(IGNORE_REC *rec)
 {
-#ifdef USE_GREGEX
 	if (rec->preg != NULL)
-		g_regex_unref(rec->preg);
+		i_regex_unref(rec->preg);
 
 	if (rec->regexp && rec->pattern != NULL) {
 		GError *re_error = NULL;
 
-		rec->preg = g_regex_new(rec->pattern, G_REGEX_OPTIMIZE | G_REGEX_RAW | G_REGEX_CASELESS, 0, &re_error);
+		rec->preg = i_regex_new(rec->pattern, G_REGEX_OPTIMIZE | G_REGEX_CASELESS, 0, &re_error);
 
 		if (rec->preg == NULL) {
 			g_warning("Failed to compile regexp '%s': %s", rec->pattern, re_error->message);
 			g_error_free(re_error);
 		}
 	}
-#else
-	char *errbuf;
-	int errcode, errbuf_len;
-
-	if (rec->regexp_compiled) regfree(&rec->preg);
-	rec->regexp_compiled = FALSE;
-
-	if (rec->regexp && rec->pattern != NULL) {
-		errcode = regcomp(&rec->preg, rec->pattern,
-				REG_EXTENDED|REG_ICASE|REG_NOSUB);
-		if (errcode != 0) {
-			errbuf_len = regerror(errcode, &rec->preg, 0, 0);
-			errbuf = g_malloc(errbuf_len);
-			regerror(errcode, &rec->preg, errbuf, errbuf_len);
-			g_warning("Failed to compile regexp '%s': %s", rec->pattern, errbuf);
-			g_free(errbuf);
-		} else {
-			rec->regexp_compiled = TRUE;
-		}
-	}
-#endif
 }
 
 void ignore_add_rec(IGNORE_REC *rec)
@@ -381,11 +355,7 @@ static void ignore_destroy(IGNORE_REC *rec, int send_signal)
 	if (send_signal)
 		signal_emit("ignore destroyed", 1, rec);
 
-#ifdef USE_GREGEX
-	if (rec->preg != NULL) g_regex_unref(rec->preg);
-#else
-	if (rec->regexp_compiled) regfree(&rec->preg);
-#endif
+	if (rec->preg != NULL) i_regex_unref(rec->preg);
 	if (rec->channels != NULL) g_strfreev(rec->channels);
 	g_free_not_null(rec->mask);
 	g_free_not_null(rec->servertag);
diff --git a/src/core/ignore.h b/src/core/ignore.h
index 80ae1d12..e18be3c4 100644
--- a/src/core/ignore.h
+++ b/src/core/ignore.h
@@ -1,9 +1,7 @@
 #ifndef __IGNORE_H
 #define __IGNORE_H
 
-#ifndef USE_GREGEX
-#  include <regex.h>
-#endif
+#include "iregex.h"
 
 typedef struct _IGNORE_REC IGNORE_REC;
 
@@ -20,12 +18,7 @@ struct _IGNORE_REC {
 	unsigned int regexp:1;
 	unsigned int fullword:1;
 	unsigned int replies:1; /* ignore replies to nick in channel */
-#ifdef USE_GREGEX
-	GRegex *preg;
-#else
-	unsigned int regexp_compiled:1; /* should always be TRUE, unless regexp is invalid */
-	regex_t preg;
-#endif
+	Regex *preg;
 };
 
 extern GSList *ignores;
diff --git a/src/core/iregex-gregex.c b/src/core/iregex-gregex.c
new file mode 100644
index 00000000..0de11e64
--- /dev/null
+++ b/src/core/iregex-gregex.c
@@ -0,0 +1,137 @@
+#include <string.h>
+
+#include "iregex.h"
+
+const gchar *
+make_valid_utf8(const gchar *text, gboolean *free_ret)
+{
+	GString *str;
+	const gchar *ptr;
+	if (g_utf8_validate(text, -1, NULL)) {
+		if (free_ret)
+			*free_ret = FALSE;
+		return text;
+	}
+
+	str = g_string_sized_new(strlen(text) + 12);
+
+	ptr = text;
+	while (*ptr) {
+		gunichar c = g_utf8_get_char_validated(ptr, -1);
+		/* the unicode is invalid */
+		if (c == (gunichar)-1 || c == (gunichar)-2) {
+			/* encode the byte into PUA-A */
+			g_string_append_unichar(str, (gunichar) (0xfff00 | (*ptr & 0xff)));
+			ptr++;
+		} else {
+			g_string_append_unichar(str, c);
+			ptr = g_utf8_next_char(ptr);
+		}
+	}
+
+	if (free_ret)
+		*free_ret = TRUE;
+	return g_string_free(str, FALSE);
+}
+
+Regex *
+i_regex_new (const gchar *pattern,
+             GRegexCompileFlags compile_options,
+             GRegexMatchFlags match_options,
+             GError **error)
+{
+	const gchar *valid_pattern;
+	gboolean free_valid_pattern;
+	Regex *ret = NULL;
+
+	valid_pattern = make_valid_utf8(pattern, &free_valid_pattern);
+	ret = g_regex_new(valid_pattern, compile_options, match_options, error);
+
+	if (free_valid_pattern)
+		g_free_not_null((gchar *)valid_pattern);
+
+	return ret;
+}
+
+void
+i_regex_unref (Regex *regex)
+{
+	g_regex_unref(regex);
+}
+
+/* if new_string is present, the caller must free new_string.
+   otherwise, g_match_info_get_string must not be used. */
+gboolean
+i_regex_match (const Regex *regex,
+               const gchar *string,
+               GRegexMatchFlags match_options,
+               MatchInfo **match_info,
+               const gchar **new_string)
+{
+	gboolean ret;
+	gboolean free_valid_string;
+	const gchar *valid_string = make_valid_utf8(string, &free_valid_string);
+
+	ret = g_regex_match(regex, valid_string, match_options, match_info);
+	if (free_valid_string) {
+		if (new_string)
+			*new_string = valid_string;
+		else
+			g_free_not_null((gchar *)valid_string);
+	}
+	return ret;
+}
+
+gsize
+strlen_pua_oddly(const char *str)
+{
+	const gchar *ptr;
+	gsize ret = 0;
+	ptr = str;
+
+	while (*ptr) {
+		const gchar *old;
+		gunichar c = g_utf8_get_char(ptr);
+		old = ptr;
+		ptr = g_utf8_next_char(ptr);
+
+		/* it is our PUA encoded byte */
+		if ((c & 0xfff00) == 0xfff00)
+			ret++;
+		else
+			ret += ptr - old;
+	}
+
+	return ret;
+}
+
+gboolean
+i_match_info_fetch_pos (const MatchInfo *match_info,
+                        gint match_num,
+                        gint *start_pos,
+                        gint *end_pos,
+                        const gchar *new_string)
+{
+	gint tmp_start, tmp_end, new_start_pos;
+	gboolean ret;
+
+	if (!new_string || (!start_pos && !end_pos))
+		return g_match_info_fetch_pos(match_info, match_num, start_pos, end_pos);
+
+	ret = g_match_info_fetch_pos(match_info, match_num, &tmp_start, &tmp_end);
+	if (start_pos || end_pos) {
+		gchar *to_start = g_strndup(new_string, tmp_start);
+		new_start_pos = strlen_pua_oddly(to_start);
+		g_free_not_null(to_start);
+
+		if (start_pos)
+			*start_pos = new_start_pos;
+
+		if (end_pos) {
+			gchar *to_end = g_strndup(new_string + tmp_start, tmp_end - tmp_start);
+			*end_pos = new_start_pos + strlen_pua_oddly(to_end);
+			g_free_not_null(to_end);
+		}
+	}
+	return ret;
+}
diff --git a/src/core/iregex-regexh.c b/src/core/iregex-regexh.c
new file mode 100644
index 00000000..aabe44f6
--- /dev/null
+++ b/src/core/iregex-regexh.c
@@ -0,0 +1,101 @@
+#include "iregex.h"
+
+Regex *
+i_regex_new (const gchar *pattern,
+             GRegexCompileFlags compile_options,
+             GRegexMatchFlags match_options,
+             GError **error)
+{
+	Regex *regex;
+	char *errbuf;
+	int cflags;
+	int errcode, errbuf_len;
+
+	regex = g_new0(Regex, 1);
+	cflags = REG_EXTENDED;
+	if (compile_options & G_REGEX_CASELESS)
+		cflags |= REG_ICASE;
+	if (compile_options & G_REGEX_MULTILINE)
+		cflags |= REG_NEWLINE;
+	if (match_options & G_REGEX_MATCH_NOTBOL)
+		cflags |= REG_NOTBOL;
+	if (match_options & G_REGEX_MATCH_NOTEOL)
+		cflags |= REG_NOTEOL;
+
+	errcode = regcomp(regex, pattern, cflags);
+	if (errcode != 0) {
+		errbuf_len = regerror(errcode, regex, 0, 0);
+		errbuf = g_malloc(errbuf_len);
+		regerror(errcode, regex, errbuf, errbuf_len);
+		g_set_error(error, G_REGEX_ERROR, errcode, "%s", errbuf);
+		g_free(errbuf);
+		g_free(regex);
+		return NULL;
+	} else {
+		return regex;
+	}
+}
+
+void
+i_regex_unref (Regex *regex)
+{
+	regfree(regex);
+	g_free(regex);
+}
+
+gboolean
+i_regex_match (const Regex *regex,
+               const gchar *string,
+               GRegexMatchFlags match_options,
+               MatchInfo **match_info,
+               const gchar **new_string)
+{
+	int groups;
+	int eflags;
+
+	g_return_val_if_fail(regex != NULL, FALSE);
+
+	if (match_info != NULL) {
+		groups = 1 + regex->re_nsub;
+		*match_info = g_new0(MatchInfo, groups);
+	} else {
+		groups = 0;
+	}
+
+	eflags = 0;
+	if (match_options & G_REGEX_MATCH_NOTBOL)
+		eflags |= REG_NOTBOL;
+	if (match_options & G_REGEX_MATCH_NOTEOL)
+		eflags |= REG_NOTEOL;
+
+	return regexec(regex, string, groups, groups ? *match_info : NULL, eflags) == 0;
+}
+
+gboolean
+i_match_info_fetch_pos (const MatchInfo *match_info,
+                        gint match_num,
+                        gint *start_pos,
+                        gint *end_pos,
+                        const gchar *new_string)
+{
+	if (start_pos != NULL)
+		*start_pos = match_info[match_num].rm_so;
+	if (end_pos != NULL)
+		*end_pos = match_info[match_num].rm_eo;
+
+	return TRUE;
+}
+
+gboolean
+i_match_info_matches (const MatchInfo *match_info)
+{
+	g_return_val_if_fail(match_info != NULL, FALSE);
+
+	return match_info[0].rm_so != -1;
+}
+
+void
+i_match_info_free (MatchInfo *match_info)
+{
+	g_free(match_info);
+}
diff --git a/src/core/iregex.h b/src/core/iregex.h
new file mode 100644
index 00000000..adeea987
--- /dev/null
+++ b/src/core/iregex.h
@@ -0,0 +1,52 @@
+#ifndef __REGEX_H
+#define __REGEX_H
+
+#include "common.h"
+
+#ifdef USE_GREGEX
+
+#include <glib.h>
+typedef	GRegex Regex;
+typedef	GMatchInfo MatchInfo;
+
+#define i_match_info_matches g_match_info_matches
+#define i_match_info_free g_match_info_free
+
+#else
+
+#include <regex.h>
+typedef	regex_t Regex;
+typedef regmatch_t MatchInfo;
+
+gboolean
+i_match_info_matches (const MatchInfo *match_info);
+
+void
+i_match_info_free (MatchInfo *match_info);
+
+#endif
+
+Regex *
+i_regex_new (const gchar *pattern,
+             GRegexCompileFlags compile_options,
+             GRegexMatchFlags match_options,
+             GError **error);
+
+void
+i_regex_unref (Regex *regex);
+
+gboolean
+i_regex_match (const Regex *regex,
+               const gchar *string,
+               GRegexMatchFlags match_options,
+               MatchInfo **match_info,
+               const gchar **new_string);
+
+gboolean
+i_match_info_fetch_pos (const MatchInfo *match_info,
+                        gint match_num,
+                        gint *start_pos,
+                        gint *end_pos,
+                        const gchar *new_string);
+
+#endif
diff --git a/src/core/misc.c b/src/core/misc.c
index 0f038cbb..4b1e72f6 100644
--- a/src/core/misc.c
+++ b/src/core/misc.c
@@ -22,10 +22,6 @@
 #include "misc.h"
 #include "commands.h"
 
-#ifndef USE_GREGEX
-#  include <regex.h>
-#endif
-
 typedef struct {
 	int condition;
 	GInputFunction function;
diff --git a/src/fe-common/core/fe-ignore.c b/src/fe-common/core/fe-ignore.c
index 800e881d..03fd4dd2 100644
--- a/src/fe-common/core/fe-ignore.c
+++ b/src/fe-common/core/fe-ignore.c
@@ -58,13 +58,8 @@ static void ignore_print(int index, IGNORE_REC *rec)
 		g_string_append(options, "-regexp ");
 		if (rec->pattern == NULL)
 			g_string_append(options, "[INVALID! -pattern missing] ");
-#ifdef USE_GREGEX
 		else if (rec->preg == NULL)
 			g_string_append(options, "[INVALID!] ");
-#else
-		else if (!rec->regexp_compiled)
-			g_string_append(options, "[INVALID!] ");
-#endif
 	}
 	if (rec->fullword) g_string_append(options, "-full ");
 	if (rec->replies) g_string_append(options, "-replies ");
diff --git a/src/fe-common/core/hilight-text.c b/src/fe-common/core/hilight-text.c
index dd38be87..6a2c97dc 100644
--- a/src/fe-common/core/hilight-text.c
+++ b/src/fe-common/core/hilight-text.c
@@ -26,6 +26,7 @@
 #include "misc.h"
 #include "lib-config/iconfig.h"
 #include "settings.h"
+#include "iregex.h"
 
 #include "servers.h"
 #include "channels.h"
@@ -101,11 +102,7 @@ static void hilight_destroy(HILIGHT_REC *rec)
 {
 	g_return_if_fail(rec != NULL);
 
-#ifdef USE_GREGEX
-	if (rec->preg != NULL) g_regex_unref(rec->preg);
-#else
-	if (rec->regexp_compiled) regfree(&rec->preg);
-#endif
+	if (rec->preg != NULL) i_regex_unref(rec->preg);
 	if (rec->channels != NULL) g_strfreev(rec->channels);
 	g_free_not_null(rec->color);
 	g_free_not_null(rec->act_color);
@@ -122,19 +119,10 @@ static void hilights_destroy_all(void)
 
 static void hilight_init_rec(HILIGHT_REC *rec)
 {
-#ifdef USE_GREGEX
 	if (rec->preg != NULL)
-		g_regex_unref(rec->preg);
+		i_regex_unref(rec->preg);
 
-	rec->preg = g_regex_new(rec->text, G_REGEX_OPTIMIZE | G_REGEX_RAW | G_REGEX_CASELESS, 0, NULL);
-#else
-	if (rec->regexp_compiled) regfree(&rec->preg);
-	if (!rec->regexp)
-		rec->regexp_compiled = FALSE;
-	else
-		rec->regexp_compiled = regcomp(&rec->preg, rec->text,
-				rec->case_sensitive ? REG_EXTENDED : (REG_EXTENDED|REG_ICASE)) == 0;
-#endif
+	rec->preg = i_regex_new(rec->text, G_REGEX_OPTIMIZE | G_REGEX_CASELESS, 0, NULL);
 }
 
 void hilight_create(HILIGHT_REC *rec)
@@ -207,30 +195,18 @@ static gboolean hilight_match_text(HILIGHT_REC *rec, const char *text,
 	gboolean ret = FALSE;
 
 	if (rec->regexp) {
-#ifdef USE_GREGEX
 		if (rec->preg != NULL) {
-			GMatchInfo *match;
+			MatchInfo *match;
+			const char *new_text = NULL;
 
-			g_regex_match (rec->preg, text, 0, &match);
+			i_regex_match(rec->preg, text, 0, &match, &new_text);
 
-			if (g_match_info_matches(match))
-				ret = g_match_info_fetch_pos(match, 0, match_beg, match_end);
+			if (i_match_info_matches(match))
+				ret = i_match_info_fetch_pos(match, 0, match_beg, match_end, new_text);
 
-			g_match_info_free(match);
+			i_match_info_free(match);
+			g_free_not_null((char *)new_text);
 		}
-#else
-		regmatch_t rmatch[1];
-
-		if (rec->regexp_compiled &&
-			regexec(&rec->preg, text, 1, rmatch, 0) == 0) {
-			if (rmatch[0].rm_so > 0 &&
-				match_beg != NULL && match_end != NULL) {
-				*match_beg = rmatch[0].rm_so;
-				*match_end = rmatch[0].rm_eo;
-			}
-			ret = TRUE;
-		}
-#endif
 	} else {
 		char *match;
 
@@ -524,13 +500,8 @@ static void hilight_print(int index, HILIGHT_REC *rec)
 	if (rec->case_sensitive) g_string_append(options, "-matchcase ");
 	if (rec->regexp) {
 		g_string_append(options, "-regexp ");
-#ifdef USE_GREGEX
 		if (rec->preg == NULL)
 			g_string_append(options, "[INVALID!] ");
-#else
-		if (!rec->regexp_compiled)
-			g_string_append(options, "[INVALID!] ");
-#endif
 	}
 
 	if (rec->priority != 0)
diff --git a/src/fe-common/core/hilight-text.h b/src/fe-common/core/hilight-text.h
index 76beec1f..1d942f29 100644
--- a/src/fe-common/core/hilight-text.h
+++ b/src/fe-common/core/hilight-text.h
@@ -1,10 +1,7 @@
 #ifndef __HILIGHT_TEXT_H
 #define __HILIGHT_TEXT_H
 
-#ifndef USE_GREGEX
-#  include <regex.h>
-#endif
-
+#include "iregex.h"
 #include "formats.h"
 
 struct _HILIGHT_REC {
@@ -24,12 +21,7 @@ struct _HILIGHT_REC {
 	unsigned int fullword:1; /* match `text' only for full words */
 	unsigned int regexp:1; /* `text' is a regular expression */
 	unsigned int case_sensitive:1;/* `text' must match case */
-#ifdef USE_GREGEX
-	GRegex *preg;
-#else
-	unsigned int regexp_compiled:1; /* should always be TRUE, unless regexp is invalid */
-	regex_t preg;
-#endif
+	Regex *preg;
 	char *servertag;
 };
 
diff --git a/src/fe-text/textbuffer.c b/src/fe-text/textbuffer.c
index 3668f4c7..eb841096 100644
--- a/src/fe-text/textbuffer.c
+++ b/src/fe-text/textbuffer.c
@@ -24,13 +24,10 @@
 #include "misc.h"
 #include "formats.h"
 #include "utf8.h"
+#include "iregex.h"
 
 #include "textbuffer.h"
 
-#ifndef USE_GREGEX
-#  include <regex.h>
-#endif
-
 #define TEXT_CHUNK_USABLE_SIZE (LINE_TEXT_CHUNK_SIZE-2-(int)sizeof(char*))
 
 TEXT_BUFFER_REC *textbuffer_create(void)
@@ -545,11 +542,7 @@ GList *textbuffer_find_text(TEXT_BUFFER_REC *buffer, LINE_REC *startline,
 			    int before, int after,
 			    int regexp, int fullword, int case_sensitive)
 {
-#ifdef USE_GREGEX
-	GRegex *preg;
-#else
-	regex_t preg;
-#endif
+	Regex *preg;
         LINE_REC *line, *pre_line;
 	GList *matches;
 	GString *str;
@@ -559,23 +552,14 @@ GList *textbuffer_find_text(TEXT_BUFFER_REC *buffer, LINE_REC *startline,
 	g_return_val_if_fail(buffer != NULL, NULL);
 	g_return_val_if_fail(text != NULL, NULL);
 
-#ifdef USE_GREGEX
 	preg = NULL;
 
 	if (regexp) {
-		preg = g_regex_new(text, G_REGEX_RAW | (case_sensitive ? 0 : G_REGEX_CASELESS), 0, NULL);
+		preg = i_regex_new(text, case_sensitive ? 0 : G_REGEX_CASELESS, 0, NULL);
 
 		if (preg == NULL)
 			return NULL;
 	}
-#else
-	if (regexp) {
-		int flags = REG_EXTENDED | REG_NOSUB |
-			(case_sensitive ? 0 : REG_ICASE);
-		if (regcomp(&preg, text, flags) != 0)
-			return NULL;
-	}
-#endif
 
 	matches = NULL; match_after = 0;
         str = g_string_new(NULL);
@@ -592,17 +576,16 @@ GList *textbuffer_find_text(TEXT_BUFFER_REC *buffer, LINE_REC *startline,
 			(line->info.level & nolevel) == 0;
 
 		if (*text != '\0') {
+			const char *tmp = NULL;
 			textbuffer_line2text(line, FALSE, str);
 
 			if (line_matched) {
 				line_matched = regexp ?
-#ifdef USE_GREGEX
-				    g_regex_match(preg, str->str, 0, NULL)
-#else
-				    regexec(&preg, str->str, 0, NULL, 0) == 0
-#endif
+					i_regex_match(preg, str->str, 0, NULL, &tmp)
 					: match_func(str->str, text) != NULL;
 			}
+			if (tmp && tmp != str->str)
+				g_free_not_null((char *)tmp);
 		}
 
 		if (line_matched) {
@@ -631,12 +614,8 @@ GList *textbuffer_find_text(TEXT_BUFFER_REC *buffer, LINE_REC *startline,
 		}
 	}
 
-#ifdef USE_GREGEX
 	if (preg != NULL)
-		g_regex_unref(preg);
-#else
-	if (regexp) regfree(&preg);
-#endif
+		i_regex_unref(preg);
         g_string_free(str, TRUE);
 	return matches;
 }