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regexstringperlextract

Regex extract some specific number from string, tried several methods

I need to extract a specific number from string in variable; for example, $ex is having URLs like "https://www.google.com&r=12345&s=1&t=2", and I need to extract 12345 only. I tried these three regexes but it's not working.

  1. This one returning =12345=1=2.

    $example = $1 if( $ex=~ s/[^=\d]//g);

  2. This one returning null.

    $example = $1 if($ex=~ m/r\=([\d+])\&/i);

  3. This one returning null.

    $example = $1 if($ex=~ m/r\^=([\d+])\&/i)
Solution 
  • use URI             qw( );
use URI::QueryParam qw( );

$url = URI->new($url);
my $example = $url->query_param('r');  # Get first `r` arguments.
my @example = $url->query_param('r');  # Get all `r` arguments.