[sf-perl] qr{} question

David Alban extasia at extasia.org
Tue May 26 12:36:34 PDT 2009

On Tue, May 26, 2009 at 12:02 PM, Bill Moseley <moseley at hank.org> wrote:
> Do you really mean to use "xms" or is that just what Perl Critic
> suggests?

/xms gives me a warm fuzzy feeling.  but...  good thought!  i found
that when i omit /x it interpolates both occurrences:


    use strict;
    use warnings;

    use Data::Dumper;

    my $FOO = 'foo';
    my $FOO_REGEX = qr{ $FOO [^#]+ -D $FOO }xms;

    print "\nwith /x:\n";
    print '$FOO: ', Dumper $FOO;
    print '$FOO_REGEX: ', Dumper $FOO_REGEX;

    my $BAR = 'bar';
    my $BAR_REGEX = qr{ $BAR [^#]+ -D $BAR }ms;

    print "\nwithout /x:\n";
    print '$BAR: ', Dumper $BAR;
    print '$BAR_REGEX: ', Dumper $BAR_REGEX;


    with /x:
    $FOO: $VAR1 = 'foo';
    $FOO_REGEX: $VAR1 = qr/(?msx-i: foo [^#]+ -D $FOO

    without /x:
    $BAR: $VAR1 = 'bar';
    $BAR_REGEX: $VAR1 = qr/(?ms-xi: bar [^#]+ -D bar )/;

(i don't care about the now-significant whitespace in the second regex
in this example.)

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