Extract the required substring from another string -Perl

Question

I want to extract a substring from a line in Perl. Let me explain giving an example:

fhjgfghjk3456mm   735373653736
icasd 666666666666
111111111111
<         


        

Answer 1

#!/bin/perl
my $var = 'fhjgfghjk3456mm 735373653736 icasd 666666666666 111111111111';
if($var =~ m/(\d{12})/) {
  print "Twelve digits: $1.";
}

Answer 2

You can do it with regular expressions:

#!/usr/bin/perl
my $string = 'fhjgfghjk3456mm 735373653736 icasd 666666666666 111111111111';
while ($string =~ m/\b(\d{12})\b/g) {
  say $1;
}

Test the regex here: http://rubular.com/r/Puupx0zR9w

use YAPE::Regex::Explain;
print YAPE::Regex::Explain->new(qr/\b(\d+)\b/)->explain();

The regular expression:

(?-imsx:\b(\d+)\b)

matches as follows:

NODE                     EXPLANATION
----------------------------------------------------------------------
(?-imsx:                 group, but do not capture (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n) (matching whitespace and #
                         normally):
----------------------------------------------------------------------
  \b                       the boundary between a word char (\w) and
                           something that is not a word char
----------------------------------------------------------------------
  (                        group and capture to \1:
----------------------------------------------------------------------
    \d+                      digits (0-9) (1 or more times (matching
                             the most amount possible))
----------------------------------------------------------------------
  )                        end of \1
----------------------------------------------------------------------
  \b                       the boundary between a word char (\w) and
                           something that is not a word char
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------

Answer 3

The $1 built-in variable stores the last match from a regex. Also, if you perform a regex on a whole string, it will return the whole string. The best solution here is to put parentheses around your match then print $1.

my $strn = "fhjgfghjk3456mm 735373653736\nicasd\n666666666666 111111111111";
$strn =~ m/([0-9]{12})/;
print $1;

This makes our regex match JUST the twelve digit number and then we return that match with $1.

Answer 4

#!/usr/bin/env perl

undef $/;
$text = <DATA>;
@res = $text =~ /\b\d{12}\b/g;
print "@res\n";

__DATA__
fhjgfghjk3456mm   735373653736
icasd 666666666666
111111111111