# Metacracters - sub-expression in Automise

**URL:** https://www.finalbuilder.com/forums/t/metacracters-sub-expression-in-automise/4334
**Category:** Discussion
**Created:** [October 22, 2008, 11:15am UTC](https://www.finalbuilder.com/forums/t/metacracters-sub-expression-in-automise/4334 "2008-10-22T11:15:41Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![ravi.k.ayyagari](https://www.finalbuilder.com/forums/letter_avatar_proxy/v4/letter/r/13edae/32.png) [@ravi.k.ayyagari](https://www.finalbuilder.com/forums/u/ravi.k.ayyagari)
#### Post date: [October 22, 2008, 11:15am UTC](https://www.finalbuilder.com/forums/t/metacracters-sub-expression-in-automise/4334/1 "2008-10-22T11:15:41Z")

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Hi,

I am trying to use Metacharacters - subexpressions from Automise.

From a file, I read a line - "Product Build Number: 12345"

My Regular expression = ^.\*Build.\*(\d)+$

How can I extract the string/integer - 12345 and assign to a variable in my automise project? Any pointers would be of great help.

&nbsp;

Thanks,

-Ravi

&nbsp;

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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: [October 27, 2008, 1:05am UTC](https://www.finalbuilder.com/forums/t/metacracters-sub-expression-in-automise/4334/2 "2008-10-27T01:05:55Z")

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Hi Ravi,  
  
You'll need to use the "Text Find / Replace" action with the parameters set as followed:  
  
Search String: ^.\*Build.\*(\b\d+\b)$  
Match as Regular Expression: Checked  
Replace Text and write back to variable: Checked  
Replacement String: $1  
Substitute regular expression matches: Checked  
  
Hope that helps :)