Re: (tye)Re: Elegant way to parse an optional prefix with default?

Yow! I didn't know it did that in character classes.

Interesting... this relies on undef being dropped in list catenation, so '&' becomes the first element?

Comment on Re: (tye)Re: Elegant way to parse an optional prefix with default?

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(tye)Re2: Elegant way to parse an optional prefix with default? by tye (Sage) on Nov 08, 2002 at 17:31 UTC
Whether to treat $ and @ as literals or not inside a regular expression is the single most complicated case of DWIM in Perl. It calculates weights to make this decision. I hate that it results in `/[$]/` being a syntax error. And it is good that character classes are not exempted as `$anagram !~ /[^\Q$word\E]/` is actually useful code. Yes, if you turn on warnings you'll get "Use of uninitialized value in pattern match (m//)". - tye	[reply] [d/l] [select]

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(tye)Re2: Elegant way to parse an optional prefix with default?
by tye (Sage) on Nov 08, 2002 at 17:31 UTC

Whether to treat $ and @ as literals or not inside a regular expression is the single most complicated case of DWIM in Perl. It calculates weights to make this decision. I hate that it results in /[$]/ being a syntax error.

And it is good that character classes are not exempted as $anagram !~ /[^\Q$word\E]/ is actually useful code.

Yes, if you turn on warnings you'll get "Use of uninitialized value in pattern match (m//)".

tye

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