Php regexp negative lookahead

Question

Php regexp negative lookahead

I am trying to combine all the words enclosed in {}, but not the words with "_loop". I do not see where I am mistaken in my expression.

 $content   = '<h1>{prim_practice_name}</h1><p>{prim_content}</p><p>Our Locations Are {location_loop}{name} - {state}<br/>{/location_loop}</p>';
 $pattern = '/\{(\w*(?!\_loop))\}/';

+5

php regex-negation

user2108258 Mar 25 '13 at 23:50

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1 answer

ole · Accepted Answer · 2013-03-26T00:18:16+0000

This is because \ w * "eats" the stop word "_loop" before you verify that you do not check the word first (before \ w *), for example the following:

$pattern = '/\{((?!\w*_loop\})\w*)\}/';

or you can use ?< !:

$pattern = '/\{(\w*(?<!_loop))\}/';

Php regexp negative lookahead

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