Find the class name by matching content within a div tag (regex/php)

Question

Here is my problem...

Based on the code below... I need a PHP script which uses Regex or some other way to extract the name of the div class which contains the text: TEXT1. In this case, return of the script should be: CLASSNAME_3

 <div class="CLASSNAME_1">
  <span class="CLASSNAME_2"></span>
   <div class="CLASSNAME_3">
   TEXT1
   </div>
 </div>

Reason for the script is, that the name of the class (CLASSNAME_3) is constantly changing, while the content of the class (TEXT1) is not.

I've researched this all over the web and also on stackoverflow, but I am unable to find the answer, nor any similar question which could help me to do this.

Avinash Raj · Accepted Answer · 2014-06-21 02:29:42Z

3

It could be possible through positive lookahead.

/\"([^"]*)(?=\">\s*TEXT1)/gm

It matches CLASSNAME_3 because it is followed by the string TEXT1.

DEMO

edited Jun 21, 2014 at 2:29

answered Jun 20, 2014 at 18:08

Avinash Raj

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3 Comments

zx81 Over a year ago

+1 for nice work on the regex, Avinash, but you have a typo in the explanation: your regex actually doesn't need DOTALL to work... There are no dots! :)

Harpreet Singh Over a year ago

+1 your answer has cleared my doubts about lookahead, though @zx81 send me a link about this but still I had some doubts and they are clear now. Thanks to you too @_zx81 will also follow lookbehind concept. :)

Avinash Raj Over a year ago

@HarpreetSingh lookbehind and lookahead options play a major role in regex. If you have any doubts just get into regex chatroom and ask questions about that.

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