Re: urgent !!! Please Help preg_replace !!!!!!!!!!!!!!!!!!!!!
| From: | Robert Cummings | Date: | Mon, 11 Feb 2008 04:57:19 +0000 |
| Subject: | Re: urgent !!! Please Help preg_replace !!!!!!!!!!!!!!!!!!!!! | ||
| References: | 1 2 3 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-269068@lists.php.net to get a copy of this message | ||
On Mon, 2008-02-11 at 13:42 +0900, Michael Moyle wrote:
> Rob,
>
>
> > $reps = array
> > (
> > array
> > (
> > 'match' => '#<a.*</a>#Uims',
>
> Can you explain what the 'U' from #Uims does? Does it have to do with
> Unicode? I can't find it anywhere (preg_match doc, man perlre, man
> perlop).
It makes the match "Ungreedy". Look at the following example:
$text = "<a href="">blah</a> ... <a
href="">bleh</a>";
If we match with the following:
preg_match_all( '#<a.*</a>#Uims', $html, $matches )
Then $matches will contain 2 matches...
1. <a href="">blah</a>
2. <a href="">bleh</a>
However if we match with the following:
preg_match_all( '#<a.*</a>#ims', $html, $matches )
Then $matches will only get 1 match...
1. <a href="">blah</a> ... <a href="">bleh</a>
This is because the default behaviour is greedy, it will match as much
as possible even if a shorter match exists.
Cheers,
Rob.
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