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preg_replace help and help with regex to handle escape characters

Posted on 2008-06-18
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Last Modified: 2010-05-18
This question is related to a previous question but requires a refinement that I need help with.

http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_23491772.html

Problem: I am reading in a language file and updating it online and need to preserve the file formatting.
Mostly working except for situation with quotes in the replacement text.

I need a preg_replace that will update the one line searching on an array key ($token) + (n number of spaces or tabs) + '==>' + (n number of spaces or tabs) and replace it with the same formatting except with my new 'string here'.

Example array in file:

$LANG_MGE07 = array (
    'search_message'                    => 'Searched for the phrase \'%s\'. Found %s items (%s seconds).',
    'member_profile_pagetitle'                => 'Member profile for:',
    'watch_default_pagetitle'                  => 'Watch Content - Home page',
    'watch_series_pagetitle'            => 'Watch Content - Series View',
    'watch_episodes_pagetitle'          => 'Watch Content - Episodes View',
    'no_search_results'                 => 'No results found matching your search request'
);

A more extreme example:
    'register_failed_message'       => '<span style="color:red">The username or email you\\\'ve provided are already in use. Please try again...</span>',  

The existing function in my class that works fine (thanks Roonaan) except in the condition where the replacement text has quotes - escaped.

    function updateToken($token, $newvalue)
    {
        $this->_content = preg_replace('#(\''.preg_quote($token).'\'\s+=>\s+)\'[^\']+\'#i', '$1\''.$newvalue.'\'', $this->_content);
    }

Can this be resolved ?

Thanks!
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Question by:Bl248
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4 Comments
 
LVL 49

Expert Comment

by:Roonaan
ID: 21820180
An alternative would be to use token-get-all. This will give you an array identifing all data as php tokens:

http://us2.php.net/manual/en/function.token-get-all.php

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Author Comment

by:Bl248
ID: 21821484
It's not that I need to parse this file to set defines that I use in my application. I need to effectively re-write this file and want to preserve any formatting and extra code, comments that are not part of the config variables that I want to update.

Once I know the $LANG_xxxxx name, I can change the value just fine in memory and code. It's how now to I update the value in the php file.

I felt that doing a fread of the file and using preg_replace on the matching token and then re-writting the file was the best solution.

I can read the file line by line on each replacement/update and find/replace the complete line but that would appear to me to be a lot of code/looping on 100's of replacements.

Is there not a regex option to add an match on quote but igore a \'

Thanks again for your help!
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LVL 49

Accepted Solution

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Roonaan earned 500 total points
ID: 21825256
Easier said than done. I ran some tests with the below, which seems to work. I might however overlooked some situations which are specific to your application:

      $this->_content = preg_replace("#('$token'\s+=>\s+)'([^\\\']|\\\.)*'#i", '$1\''.$newvalue.'\'', $this->_content);
0
 

Author Comment

by:Bl248
ID: 21828018
Thanks very much for your help!
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