http://www.perlmonks.org?node_id=1179900


in reply to Feature Idea: qr//e (updated with solutions)

my $regex = qr{(??{ join '|', map {quotemeta} qw/. | %/ })};

No? Plus, it's eval'ed "before parsing a regex", while s///e is not about it at all.

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Re^2: Feature Idea: qr//e (updated)
by haukex (Bishop) on Jan 19, 2017 at 12:00 UTC

    Hi vr,

    my $regex = qr{(??{ join '|', map {quotemeta} qw/. | %/ })};

    Another excellent idea, thank you! I've updated my root node.

    it's eval'ed "before parsing a regex", while s///e is not about it at all

    Yes, you're right, it was misleading of me to write that qr//e would be "analogous to s///e", since in s///e it's the replacement part that gets evaled, not the regex.

    Update: Your solution has the interesting feature that the code gets reevaluated every time:

    use Test::More; my @values = qw/abc def/; my $re = qr{^(??{ join '|', map {quotemeta} @values })$}i; like 'ABC', $re; like 'DEF', $re; unlike 'GHI', $re; push @values, 'ghi'; like 'ABC', $re; like 'DEF', $re; like 'GHI', $re; done_testing;

    Thanks,
    -- Hauke D