use strict;
my $str = '123
123,45
123,456
123,4567';
my $regex = qr~(^[0-9]*\.[0-9]{2}$)~p;
my $subst = '';
my $result = $str =~ s~$regex~$subst~rg;
print "The result of the substitution is' $result\n";
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html