Not a great improvement on the other solutions (below). However, making a single structure saves space and allows for a way to easily see things in the debugger (as shown). Also, no need to scan the list again to obtain the max length.

#!/usr/bin/perl -w
use strict;

my $maxLen = 0;

my $aline = qq~an interesting line of text I would like to scan I see 
+I see I see~;

my @regexes = (['first',qr/should fail/,0] , ['second','like',0] , ['t
+hird',qr/I/,0] , ['fourth',qr/scan/,0]);

sub niceOutput {for(@regexes){ printf "%-${main::maxLen}s %30d\n", $_-
+>[1],$_->[2] if $_->[2] > 0} } 

sub resetRegexes {for(@regexes){$_->[2] = 0}}

sub rexyScan {my $Len = 0;  for my $n(@regexes){ ++$n->[2] while ($ali
+ne=~m/$n->[1]/g); $Len = length $n->[1]; if($Len > $maxLen) { $main::
+maxLen = $Len } };  }

&rexyScan;
&niceOutput;

[download]

Debugger shows @regexes:

main::(-e:1):    0
  DB<1> @regexes = (['first',qr/interesting/,0] , ['second','like',0] 
+, ['third',qr/I/,0] , ['fourth',qr/scan/,0]);

  DB<2> x @regexes
0  ARRAY(0x569bf962c388)
   0  'first'
   1  (?^u:interesting)
      -> qr/(?^u:interesting)/
   2  0
1  ARRAY(0x569bf95f6650)
   0  'second'
   1  'like'
   2  0
2  ARRAY(0x569bf95f68d8)
   0  'third'
   1  (?^u:I)
      -> qr/(?^u:I)/
   2  0
3  ARRAY(0x569bf95f6428)
   0  'fourth'
   1  (?^u:scan)
      -> qr/(?^u:scan)/
   2  0
  DB<3>

[download]

Celebrate Intellectual Diversity

In reply to Re: Filter output based on values by InfiniteSilence
in thread Filter output based on values by LexPl

Title:
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, details, 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, summary, 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.