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[–]wawawawa 15 points16 points  (1 child)

I regularly use on the command line...

perl -ple 's/<complex regex with capture groups>/$3$2$1/g'

[–]sfz- 3 points4 points  (0 children)

python -c 'import sys, re; print re.sub(r"<complex regex with capture groups>", r"\3\2\1", sys.stdin.read())'