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comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
$re = "(?:$flags:$core)";

That doesn't work: too many  ':' (colons):

c:\@Work\Perl\monks>perl -wMstrict -le "my $string = '/.*uba$/i'; ;; my $flag = qr{ [msixpodual] }xms; ;; my $convertable = my ($core, $flags) = $string =~ m{ \A \s* / (.*?) / ($flag*) \z }xms; die qq{bad rx: '$string'} unless $convertable; ;; my $re = qq{(?:$flags:$core)}; print $re; print 'A: match' if 'uba' =~ $re; " (?:i:.*uba$)
Something like this works:
c:\@Work\Perl\monks>perl -wMstrict -le "my $string = '/.*u\/ba$/i'; ;; my $flag = qr{ [msixpodual] }xms; ;; my $convertable = my ($pattern, $modifiers) = $string =~ m{ \A \s* / (.*?) / ($flag*) \z }xms; die qq{bad rx: '$string'} unless $convertable; ;; my $rx = qr{(?$modifiers)$pattern}; print $rx; print 'A: match' if 'u/Ba' =~ $rx; ;; my $ry = qr{ \A foo $rx }xms; print $ry ;; print 'B: match' if 'foolubatU/bA' =~ $ry; print 'C: match' if 'FoolubatU/bA' =~ $ry; " (?^:(?i).*u\/ba$) A: match (?^msx: \A foo (?^:(?i).*u\/ba$) ) B: match
Note that:
  • I go directly to  qr// form.
  • The modifiers ($flag pattern) implemented vary by Perl version; see perlop.


Give a man a fish:  <%-{-{-{-<


In reply to Re^2: creating qr from existing regex by AnomalousMonk
in thread creating qr from existing regex by Bobert1234

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