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Re: /i resets $1 on failed matches?
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Andy_-@wiwb.uscourts.gov
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Jul 12, 2004 15:51 PDT
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Thanks Andy, er, that's why I suggested:
cat b.txt |
perl -ne 'print "$1\n"
if /(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/;'
The question (lost, as always, amongst my ramblings) was why '/i' seems to
avoid the "$1 retains the value of the last successfull match so testing
it after a failed match gets you a defined (and old) value" gotcha of
perl.
a
Andy Bach, Sys. Mangler
Internet: andy_-@wiwb.uscourts.gov
VOICE: (608) 261-5738 FAX 264-5932
Beware of bugs in the above code; I have only proved it correct, not tried
it. -- Donald Knuth
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