# RegEx engine problem

**URL:** https://www.finalbuilder.com/forums/t/regex-engine-problem/1197
**Category:** Discussion
**Created:** [May 4, 2009, 9:20am UTC](https://www.finalbuilder.com/forums/t/regex-engine-problem/1197 "2009-05-04T09:20:21Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![deleted\_user](https://www.finalbuilder.com/forums/user_avatar/www.finalbuilder.com/deleted_user/32/937_2.png) [@deleted\_user](https://www.finalbuilder.com/forums/u/deleted_user)
#### Post date: [May 4, 2009, 9:20am UTC](https://www.finalbuilder.com/forums/t/regex-engine-problem/1197/1 "2009-05-04T09:20:21Z")

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Hi, I am trying to use lookaround in my RegEx matches but the engine doesn't seem to support it.

Do you have any clue on what could replace it ?

\*.(?=,)

Would match   
Hi,  
in  
Hi, my name is Luc.

But the engine fail to do Lookarounds it seems.

Best regards,

Luc

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### Author: ![paulsamways](https://www.finalbuilder.com/forums/letter_avatar_proxy/v4/letter/p/e8c25b/32.png) [@paulsamways](https://www.finalbuilder.com/forums/u/paulsamways)
#### Post date: [May 5, 2009, 1:07am UTC](https://www.finalbuilder.com/forums/t/regex-engine-problem/1197/2 "2009-05-05T01:07:29Z")

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Hi Luc,   
  
 It looks like the regular expression library we’re using in FinalBuilder does not support look-arounds ([http://regexpstudio.com/TRegExpr/Help/RegExp\_Syntax.html](http://regexpstudio.com/TRegExpr/Help/RegExp_Syntax.html)). You’ll either need to use the run script action to write the regex using Javascript ([http://www.w3schools.com/JS/js\_obj\_regexp.asp](http://www.w3schools.com/JS/js_obj_regexp.asp)), or change the expression to not use look-arounds.   
  
 Regards,   
 Paul.