I recommend against using these (a parser would work better), but here's a snippet from my scratchpad:

/^(?:(?!$re).)*$/          # NOT re
/$re1|$re2/                # re1 OR re2
/^(?=.*$re1)(?=.*$re2)/    # re1 AND re2

[download]

NOT must be anchored on both ends, but it doesn't have to be with ^ and $.

AND doesn't have to be anchored, but if the start is anchored (with ^ or by some other means), it should speed up the case where there is no match.

The .* in AND may need to be replaced so it doesn't look too far ahead.

In reply to Re: Boolean operators in PERL regexp? by ikegami
in thread Boolean operators in PERL regexp? by lenrobert

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