note 84512 added to function.preg-split

<? $s = '<p>bleh blah</p><p style="one">one two three</p>'; $htmlbits = preg_split('/(<p( style="[-:a-z0-9 ]+")?>|<\/p>)/i', $s, -1, PREG_SPLIT_DELIM_CAPTURE); print_r($htmlbits); ?> Array ( [0] => [1] => <p> [2] => bleh blah [3] => </p> [4] => [5] => <p style="one"> [6] => style="one" [7] => one two three [8] => </p> [9] => ) two interesting bits: 1. When using PREG_SPLIT_DELIM_CAPTURE, if you use more than one pair of parentheses, the result array can have members representing all pairs. See array indexes 5 and 6 to see two adjacent delimiter results in which the second is a subset match of the first. 2. If a parenthesised sub-expression is made optional by a following question mark (ex: '/abc (optional subregex)?/') some split delimiters may be captured in the result while others are not. See array indexes 1 and 2 to see an instance where the overall match succeeded and returned a delimiter while the optional sub-expression '( style="[-:a-z0-9 ]+")?' did not match, and did not return a delimiter. This means it's possible to have a result with an unpredictable number of delimiters in the result array. This second aspect is true irrespective of the number of pairs of parentheses in the regex. This means: in a regular expression with a single optional parenthesised sub-expression, the overall expression can match without generating a corresponding delimiter in the result. ---- Server IP: 209.41.74.194 Probable Submitter: 69.229.223.91 ---- Manual Page -- http://www.php.net/manual/en/function.preg-split.php Edit -- https://master.php.net/note/edit/84512 Del: integrated -- https://master.php.net/note/delete/84512/integrated Del: useless -- https://master.php.net/note/delete/84512/useless Del: bad code -- https://master.php.net/note/delete/84512/bad+code Del: spam -- https://master.php.net/note/delete/84512/spam Del: non-english -- https://master.php.net/note/delete/84512/non-english Del: in docs -- https://master.php.net/note/delete/84512/in+docs Del: other reasons-- https://master.php.net/note/delete/84512 Reject -- https://master.php.net/note/reject/84512 Search -- https://master.php.net/manage/user-notes.php