Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I've started playing with the named capture and grammar features of 5.10. I like what I see, but I did find something that stumped me.

If I use a named capture I get what I expect:

#!/usr/local/bin/perl use strict; use warnings; use Data::Dumper; my $number_re = qr{ (?<int> \d+) }x; my $num = 15; if ( $num =~ /^$number_re$/ ) { warn "'$num' is valid\n"; warn Dumper( \%- ); } # produces: #'15' is valid #$VAR1 = { # 'int' => [ # '15' # ] # };
But, when I try to DEFINE a grammar, the named capture only stores undef:
#!/usr/local/bin/perl use strict; use warnings; use Data::Dumper; my $number_re = qr{ (?(DEFINE) (?<int> \d+ ) ) (?&int) }x; my $num = 15; if ( $num =~ /^$number_re$/ ) { warn "'$num' is valid\n"; warn Dumper( \%- ); } # produces: #'15' is valid #$VAR1 = { # 'int' => [ # undef # ] # };
Am I missing something?

(Perhaps my excitement at the new grammar features has raised my expectations too high. I was starting to hope for a parse tree.)


The Gantry Web Framework Book is now available.

In reply to 5.10 named capture in DEFINE regex by philcrow

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    [stevieb]: In msg, how do I message someone with a space in their name. For example, I want to privately message "Your Mother", but am unsure of how to do so. Link/tips?
    [pryrt]: In the link brackets...
    [stevieb]: guys, not *your* mother, "Your Mother" here on PM. Sheesh. Like I haven't spoken to your mom
    [stevieb]: pryrt the brackets work in such a thing? I have nobody to test against. I will try :)
    [Your Mother]: /ignore ALLTHEMONKS!
    [pryrt]: It says so in the cb faq

    How do I use this? | Other CB clients
    Other Users?
    Others about the Monastery: (6)
    As of 2018-03-23 00:38 GMT
    Find Nodes?
      Voting Booth?
      When I think of a mole I think of:

      Results (287 votes). Check out past polls.