Re: match sequences of words based on number of characters

[Anonymous Monk]

add use re 'debug'; to see what the regex engine is doing, and why your match fails

Then, use my @list = grep $lengthy, split /\W/, $str

Where

 my $lengthy = do {
   my @lengths = ( 2, 6, 6 );
   my $lix = 0;
   sub {
      if( $lix < @lis and $lengths[ $lix ] == length $_ ){
          $lix++;
          return !!1;
      }
      return !!0;
   }
};

or whatever counting logic you require

[AnomalousMonk]

I tried a few variations and I can't seem to make that work. Can you supply a self-contained, working example?

[nicemank]

Hi, when I run your code it produces nothing. Did I miss something? Thanks for your advice, nicemank.

[AnomalousMonk]

Are you replying to me (AnomalousMonk) or to the Anonymous Monk?

[Anonymous Monk]

I tried a few variations and I can't seem to make that work.

Show your efforts :)

What do you think is wrong with it?

Can you supply a self-contained, working example?

Theoretically :) did you try Basic debugging checklist?

I think this ought to show what is wrong with my syntax

#!/usr/bin/perl --
use strict; use warnings; use Data::Dump;
my $str = "xxxx yy zzzzz xxxx qqq";
my $lengthy = sub { warn 1 };
my @list = grep $lengthy, split /\W/, $str;
dd \@list;
__END__

Its basically as if I wrote grep 1, ...

and here I thought grep knew to take a subroutine reference, it works with grep \&somename, but it has to be grep $lengthy->(),...

And on top of that no warnings of any kind, surprising

[Anonymous Monk]

#!/usr/bin/perl --
use strict; use warnings; use Data::Dump;
my $str = "xxxx yy zzzzz xxxx qqq sixsix";
my $lengthy = do {
   my @lengths = ( 2, 6, 6 );
   my $lix = 0;
   sub {
       warn "shabba @_ $_";
      if( $lix < @lengths and $lengths[ $lix ] == length $_ ){
          $lix++;
          return !!1;
      }
      return !!0;
   }
};
#~ grep 1, #~ my @list = grep $lengthy, split /\W/, $str;
#~ grep 1, #~ my @list = grep sub { $lengthy->() }, split /\W/, $str;
#~ slower #~ my @list = grep { $lengthy->() } split /\W/, $str;
my @list = grep $lengthy->() , split /\W/, $str;
dd \@list;
__END__
shabba  xxxx at funk line 8.
shabba  yy at funk line 8.
shabba  zzzzz at funk line 8.
shabba  xxxx at funk line 8.
shabba  qqq at funk line 8.
shabba  sixsix at funk line 8.
["yy", "sixsix"]