#!/usr/bin/perl
use strict; # https://perlmonks.org/?node_id=11132725
use warnings;
while( <DATA> )
{
print /(?<!\d)5\d{8}(?!\d)/ ? ' ' : 'not', " found in : ", $_;
}
__DATA__
for me. "503009496" and i w
for me. "603055496" and i w (6)
for me. "703509496" and i w (7)
for me. "53009496" and i w (too short)
for me. "5093009496" and i w (too long)
for me. "503009496" and i w
Outputs:
found in : for me. "503009496" and i w
not found in : for me. "603055496" and i w (6)
not found in : for me. "703509496" and i w (7)
not found in : for me. "53009496" and i w (too short)
not found in : for me. "5093009496" and i w (too long)
found in : for me. "503009496" and i w
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