On Tue, 9 Jul 2013 11:34:55 +0200, Boris Lenz wrote:
>does
>
>/(?!)/
>
>work for you?
>
Thanks! I never woulda thoughta that. Seems to work for sed and
grep; nearly an exhaustive sample. Now I need to try to understand it:
It matches any string which is not ("!") matched by 0 or 1 ("?") copies
of the null string (which appears between "(" and "?"). The "(" and ")"
indicate grouping. I have no idea why that's necessary. Perhaps
operator precedence? Would any of /(?!)/, /(?)!/, or even /()?!/ work
alike? Why not?
And, of course, there are many flavors of regex, all with different rules.
Thanks again,
gil
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