trigger: allow chars '\' and '(' as delimiter in regex

src/plugins/trigger/trigger-config.c

@@ -310,9 +310,9 @@ trigger_config_create_trigger_option (const char *trigger_name, int index_option
                    "many regex can be separated by a space, for example: "
                    "\"/regex1/replace1/var1 /regex2/replace2/var2\"; the "
                    "separator \"/\" can be replaced by any char (one or more "
-                   "identical chars), except '\\' and parentheses; matching "
-                   "groups can be used in replace: $0 to $99, $+ for last "
-                   "match and $.cN to replace all chars of group N by char c"),
+                   "identical chars); matching groups can be used in replace: "
+                   "$0 to $99, $+ for last match and $.cN to replace all chars "
+                   "of group N by char c"),
                 NULL, 0, 0, value, NULL, 0, NULL, NULL,
                 &trigger_config_change_trigger_regex, NULL, NULL, NULL);
             break;

src/plugins/trigger/trigger.c

@@ -534,8 +534,6 @@ trigger_regex_split (const char *str_regex,
         delimiter = weechat_strndup (ptr_regex, pos - ptr_regex);
         if (!delimiter)
             goto memory_error;
-        if ((strcmp (delimiter, "\\") == 0) || (strcmp (delimiter, "(") == 0))
-            goto format_error;
 
         length_delimiter = strlen (delimiter);