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Re: efficient regular expression that never matches
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From: |
John Wiegley |
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Subject: |
Re: efficient regular expression that never matches |
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Date: |
Fri, 20 Nov 2015 07:59:39 -0800 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (darwin) |
>>>>> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> I'm thinking of "$a", but it should scan all the string until end of the
>> string, so it may not be efficient.
> IIRC I used something like "\\`\\'a".
Yes, also because "$" only has special meaning as the last character of the
regexp, whereas \\' should always mean "end of <context>".
John