You've said the substitution is changing the output to O_PREFIX=NEWOLD where you want O_PREFIX=NEW, for some value of NEW and OLD. Perhaps whatever follows O_PREFIX doesn't actually match \w+? (Though it would have to at least start with a character matching \w, or the substitution wouldn't happen at all.)

\w usually matches any of A-Z, a-z, 0-9, or _. If you have a larger character set you need to match, \w is not the right choice. Perhaps you could try it ass/O_PREFIX=.*/O_PREFIX=$newUser/ (which would replace from = up to the end of the line) or s/O_PREFIX=\S+/O_PREFIX=$newUser/ (which would replace from = up to a whitespace character (space, formfeed, tab, linefeed, or carriage return)).

(What \w matches may be expanded if in the scope of use locale or matching on Unicode data.)

In reply to Re: REGEX with input file by ysth
in thread REGEX with input file by samy1212

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