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923.Regular expression replace -- How to remove everything after the first comma in each line in a text file?

User: Simon -- 2012-02-21          << 922  924 >>
Hits: 26256
Type: Regular expression replace   
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Description:
How to remove everything in a text file after first comma in each line without deleting first coma?
Input Sample:
word1,word2,word3,word,word5,
Output Sample:
word1,
Answer:
Hint: You need to Download and install "Replace Pioneer" on windows platform to finish following steps.
1. ctrl-o open source text file 
2. ctrl-h open 'replace' dialog 
* set 'search for pattern' to: 
 
* set 'replace with pattern' to: 
 
3. click 'replace', done.

Screenshot 1:  Replace_Window


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