Re: Matching over multiple lines in a scalar

[BrowserUk]

#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
my $info;
$info .= $_ while(<DATA>);
my %lines;

while($info =~ m/(?:^|\n)(\d+)\:(.+?)(?=(?:\n\d)|$)/gs) {
  $lines{$1} = $2;
}

print Dumper (\%lines);

__DATA__
3: Tag <test> found
Tag <test> found
5: Tag <test> found
7: Tag <test> found
14: Tag <test> found
16: Tag <test> found
18: Tag <test> found
21: Tag <test> found
25: Tag <test> found
27: Tag <test> found
29: Tag <test> found
32: Tag <test> found
34: Tag <test> found
49: Tag <test> found
80: Tag <test> found
98: Tag <test> found
Tag <test> found

Gives

c:\test>208384
$VAR1 = {
          '29' => ' Tag <test> found',
          '21' => ' Tag <test> found',
          '7' => ' Tag <test> found',
          '14' => ' Tag <test> found',
          '80' => ' Tag <test> found',
          '32' => ' Tag <test> found',
          '16' => ' Tag <test> found',
          '49' => ' Tag <test> found',
          '25' => ' Tag <test> found',
          '3' => ' Tag <test> found
Tag <test> found',
          '98' => ' Tag <test> found
Tag <test> found',
          '34' => ' Tag <test> found',
          '18' => ' Tag <test> found',
          '27' => ' Tag <test> found',
          '5' => ' Tag <test> found'
        };

c:\test>

---

Nah! Your thinking of Simon Templar, originally played by Roger Moore and later by Ian Ogilvy

[Rich36]

Thanks for the help on this. By the way - just out of curiosity - why pass a hash reference to Data::Dumper instead of just the hash?


«Rich36»

[BrowserUk]

If you pass the hash, it gets flattened and passed as a list of 30 seperate scalars, the association between key=>value pairs is lost. By passing the reference, Data::Dumper knows it a hash, and outputs it as such, with the Key=>value pairs clearly associated and shown as being a part of a compound entity.

In fact, you can then write this output to a file and then read it back, eval the string and it will recontruct the hash in memory. Often used as a cheap man DB.

Run the program both ways to see the difference.

---

Nah! Your thinking of Simon Templar, originally played by Roger Moore and later by Ian Ogilvy