Hi,
I'd go with split: 
#!/usr/bin/perl

use strict;
use warnings;

my @Read = <DATA>;

for (@Read){
  next unless /^Number-/;
  chomp;
  $_ =~ s/Number-//g;
  my @numbers = split(/,/);
  print join("\n", @numbers),"\n";
}

__DATA__
Number:
Number-1999-1011
----------------------------------------
Number:
Number-1999-0696
----------------------------------------
Number:
Number-1999-0833,Number-2004-0786,Number-2004-0747,Number-2004-075,Num
+ber-2004-0748,Number-2004-0809
----------------------------------------
Number:
Number-2000-1209
----------------------------------------

[download]
output: 
1999-1011
1999-0696
1999-0833
2004-0786
2004-0747
2004-075
2004-0748
2004-0809
2000-1209

[download]

Regards,
svenXY

update: I personally prefer the solution moritz++ offered above. It's also more regex-like - as was asked for in the OP.

In reply to Re: how to search a pattern occured more than once in line by svenXY
in thread how to search a pattern occured more than once in line by mpatharkar

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