Find and replace everything between and including parentheses
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 I have a txt file 
 Example:
 STR-405384
 Getting the hang of this now![COMMENT Addictedness string]STR-442968 
 Run At Defence[COMMENT - high dribbling tactic]STR-443001 
 The current squad tends to fear playing in big matches[COMMENT
 Team report traits; keep short]
 STR-443002
 We have a calm và amicable group of players[COMMENT
 Team report traits; keep short]I want the result is 
 STR-405384
 Getting the hang of this now!STR-442968 
 Run At Defence
 STR-443001
 The current squad tends to fear playing in big matches
 STR-443002
 We have a calm và amicable group of players
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 I used 
 Find what:\[COMMENT .*?\]
 and check the regular expression
 But resuilt is no exactly
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 Hello @haitt2102, and All, Your regex is quite correct but ONLY IF the [COMMENT.....]area of chars belongs to an unique line, as in the first two occurrences of your example !So, you must use the (?s)modifier syntax to be sure that the dot regex meta-charaqcter match any single char ( standard or EOL chars ) in order that a match may be spread out on several lines !Thus, this regex S/R should work : SEARCH (?s)\[.+?\]REPLACE Leave EMPTYIf your text may also content square bracket(s) as normal characters, the regex, below, will be more restrictive : SEARCH (?s-i)\[COMMENT.+?\]Note that I added the (?-i)modifier ( meaningno-insensitive), to be sure that the regex engine will search for the uppercase string COMMENTRemarks : - 
The (?s)or(?-s)has higher priority than the. matches newlineoption of the Find/Replace dialog. Idem for the(?i)or(?-i)modifiers, regarding theMatch caseoption
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Notice, also, that the (?s)\[.+?\]regex, could be replaced with the\[(.|\R)+?\]regex, which matches exactly the same occurrences, as\Rmatch any kind of new-line characters !
 Cheers, guy038 
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