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Dynamic backreferences, finding last in a group [message #179065]

Sun, 09 September 2012 10:31

jwcarlton
Messages: 76
Registered: December 2010

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I'm working with preg_replace(), like so:

$pattern = array();
foreach ($filter as $org)
array_push($pattern, "/((<br>|\s)*)$org(er|in|...)/i");

$text = preg_replace($pattern, '$1$new$3', $text);

The issue I'm having is when $org contains a regex expression, like:

(D|d)ear

in which case (er|in|...) would now be $4 instead of $3.

The question is, is there a way that I can dynamically find the last backreference in the pattern, instead of referring to it strictly by number?

If not, I could always check to see if $org contains a (...), and then set the number accordingly. But this is in a foreach loop, and putting an strpos() in a loop like that seems slow; and then, I'm not sure that a backreference like this would works. Like:

if (strpos...) $num = "4";
else $num = "3";

$text = preg_replace($pattern, '$1$new$$num', $text);

Any suggestions?

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[Message index]

		Dynamic backreferences, finding last in a group By: jwcarlton on Sun, 09 September 2012 10:31
		Re: Dynamic backreferences, finding last in a group By: Anders Wegge Keller on Sun, 09 September 2012 11:51
		Re: Dynamic backreferences, finding last in a group By: Scott Johnson on Sun, 09 September 2012 14:16

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