preg_replace help - ignore spaces and tabs

I want to parse a PHP config file and replace certain defines.

So if I have an array like the following and want to read the file and replace the define for 'most_viewed'. I could do a preg_replace on that line and re-write the file. I need a preg_replace that will update that one line searching on 'most_viewed' + (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'.

$LANG_MGE01 = array (
    'featured_series'                   => 'Featured Series',
    'featured_episodes'                 => 'Featured Episodes',
    'featured'                          => 'Featured',
    'most_viewed'                       => 'Most Viewed',
    'most_discussed'                    => 'Most Discussed',
    'most_recent'                       => 'Most Recent'
}

Can that be done with a preg_replace where the search string match is saved as an argument and then used in the replace so the line formatting is preserved.
Bl248Asked:
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RoonaanConnect With a Mentor Commented:
Try:

$token = 'most_viewed';
$new_value = 'Meest bekeken';

$new_config = preg_replace('#(\''.preg_quote($token).'\'\s+=>\s+)\'[^\']+\'#i', '$1\''.$new_value.'\'', $config);
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Bl248Author Commented:
Howly crap that was fast -- I will give it a try :)
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Bl248Author Commented:
That is working quite nicely - thanks!
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Bl248Author Commented:
While testing, I came across an issue with the above solution and wanted to see if I could request a fix (please).

If the contents that I want to replace have an escaped quote then the replace on text to replace between quotes fails - or inserts the new text in the middle of the old text is a better descriptiopn of the issue.

Example:
$LANG_MGE01 = array (
    'featured_series'                   => 'Featured Series',             // Testing
    'featured_episodes'                 => 'Featured Episodes',
    'featured'                          => 'Ain\'t this a featured item',
    'most_recent_featured'              => 'Most Recent',   // Test comment - most recent
    'most_viewed'                       => 'Most Viewed'
}

Doing a replace on token 'featured' will have an issue.
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