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My beloved TextPad says "out of memory" after a while when trying to perform this operation. Next best (i.e. simplest/fastest) free tool to do this?

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up vote 6 down vote accepted

Install ActivePerl (only 25MB .msi file) and run this one-liner:

perl -pe "s/regex/replacement/g" <input.txt >output.txt

You can even use it for in-place editing like this:

perl -pi.bak -e "s/regex/replacement/g" file.txt
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I just happened to have Perl installed. Thanks! (@fcorrao I also +1'd you) – Kev Apr 2 '13 at 13:23

Install cygwin and use sed to perform the search and replace.

e.g. sed -e 's/findthis/replacewiththis/g' < /path/to/bigfile > /path/to/newfile

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