Kind of a programming challenge, in view of all the PCRE
chatter hereabouts lately:
A vendor once supplied an interface where one of the required
arguments was a regex to exclude from processing any matching
line. But I wanted every line in my data processed. So, how?
For my particular data, I could use:
/Pattern that I know does not occur in my data/
or:
/ \000 \012 /
... unlikely to occur in lines processed by sed or awk. But is there
a general case: a regex that will never match any string whatever?
-- gil
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