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In my XML file there are lots of sub strings starting with STDSUP- and then three digits. For example: STDSUP-123. I would like to replace the STDSUP with CCDA. There are some sub strings where STUSUP- is following by non-numeric characters. I don't want to change them. So, I used STDSUP-\d\d\d in the find field and CCDA-\d\d\d in the replace with field. But the three digits are getting replaces with ddd. I want to replace only STDSUP and want the digits unchanged.

Any help?

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To keep part of the string intact, you want to use a group in your "find" expression and a backreference in your "replace" one.

Find: STDSUP-(\d\d\d)
Replace: CCDA-\1

screencap

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Starting in Notepad++ version 6, you can also separate the match with PCRE-style capture groups:

Find What: (STDSUP-)(\d\d\d)

Replace with: CCDA-$2

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-1: This does not work in Notepad++ - it replaces the digit string the OP wanted to preserve with $2. See this screencap. – nc4pk Jul 22 '13 at 19:05
1  
It works in Notepad++ starting in version 6. see: stackoverflow.com/a/11970406/1521193 – kjh23 Jul 22 '13 at 19:12
    
Ah, my bad. I was still running the old version. Edited and undownvoted :) – nc4pk Jul 22 '13 at 19:18

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