use strict;
my $str = '0
0.1
0.12
0.123
10.0
10.00
9.99
1.12
2.34
11.1
1
2
3
4
5
6
7
8
9
1.1
2.12
3.32
4.45
5.67
6.98
7.12
8.3
9.56
10
1.1234';
my $regex = qr/^[0-9](?:\.[0-9]{1,2})?$|^10(?:\.00?)?$/mp;
if ( $str =~ /$regex/g ) {
print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n";
# print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n";
# print "Capture Group 2 is $2 ... and so on\n";
}
# ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p'
# Named capture groups can be called via $+{name}
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