&reftitle.constants; &extension.constants; constant description PREG_PATTERN_ORDER Orders results so that $matches[0] is an array of full pattern matches, $matches[1] is an array of strings matched by the first parenthesized subpattern, and so on. This flag is only used with preg_match_all. PREG_SET_ORDER Orders results so that $matches[0] is an array of first set of matches, $matches[1] is an array of second set of matches, and so on. This flag is only used with preg_match_all. PREG_OFFSET_CAPTURE See the description of PREG_SPLIT_OFFSET_CAPTURE. This flag is available since PHP 4.3.0 . PREG_SPLIT_NO_EMPTY This flag tells preg_split to only return only non-empty pieces. PREG_SPLIT_DELIM_CAPTURE This flag tells preg_split to capture parenthesized expression in the delimiter pattern as well. This flag is available since PHP 4.0.5 . PREG_SPLIT_OFFSET_CAPTURE If this flag is set, for every occuring match the appendant string offset will also be returned. Note that this changes the return value in an array where very element is an array consisting of the matched string at offset 0 and it's string offset into subject at offset 1. This flag is available since PHP 4.3.0 and is only used for preg_split.