[support] preg_match failes where egrep and PERL succeed?

[CM Lubinski]

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Just discovered that this could also be solved with the 'm' flag:
http://www.php.net/manual/en/reference.pcre.pattern.modifiers.php

The 's' flag is also very useful if your expression will be matched
across lines.

Good to know!

CM Lubinski

Luke wrote:
> (Solved!  See below for details.)
> 
> On Wed, 3 Feb 2010, CM Lubinski wrote:
> 
>> I think this is an issue with your escaping but my eyes are not keen
>> enough to see where the error is.
> 
> Moving the code into an include, and running:
> 
> drush 2> /dev/null eval 'include("/tmp/drupal.inc");'
> 
> Gets me a no-matcher.
> 
>> The regular expression itself works fine:
>> <?php
>>  function get_matches($to_match) {
>>    preg_match('/^\d{3}\|([0-9a-fA-F]+)/', $to_match, $match);
> 
> That assumes a single search string.  I hardcoded the "200" where you 
> have "\d+", because what actually happens is that the three digit code is 
> obtained on the fly from a variable.  So the regex is to search a group of 
> lines with that format, and when it gets to the one containing "200" at 
> the start, kick back the second part.
> 
> I tried it with your version, though, and it returned the first line's 
> RHS, as I would expect--1 match.
> 
> I've just figured it out.  The difference between the greps and 
> PCRE, is that in the greps, the data is taken on a line by line basis. 
> So, ^ matches the start of a line.
> PCRE is not treating newline specially, so ^ and $ apply to the beginning 
> and end of the entire pattern space.
> 
> Rewriting it with:
> 
> $res = preg_match('/\b' . $search_for . '\|([0-9a-fA-F]{6})/',
> $match_against, $match);
> 
> gets the job done.
> 
> Thanks for considering it.
> 
> Luke
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