Repetition of a subpattern will repeat conditionals that are contained inside it, updating subpattern matches with iteration.
Consider the following code, which scans thru HTML, keeping track of angle brackets "<" ">". If open bracket "<" matches, then closing bracket ">" must follow before repetition can possibly end. That way regex will effectively match only outside of tags.
<?php
$pattern='%(*ANY)(.*?(<)(?(2).*?>)(.*?))*?\'\'%s';
$replace='\1Fred';
$subject=
'<html><body class=\'\'>\'\' went to '\'\meyer and ran
into <b>\'\'</b>.
</body></html>'
echo preg_replace($pattern,$replace,$subject);
?>
Output will be:
'<html><body class=\'\'>Fred went to Fredmeyer and ran
into <b>Fred</b>.
</body></html>'
----
Server IP: 69.147.83.197
Probable Submitter: 24.113.79.192
----
Manual Page -- http://www.php.net/manual/en/regexp.reference.conditional.php
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