use strict;
my $str = '10,10 + 9, 9
10,1,0+9,9
10,10,+,9,9
10,10+9,9
10+9,0
10,0+9
10+9
10,0+9,4
10,2+3
,?(\\d+)?|(\\+|-|\\*|\\/|\\,|)
(\\+|\\-|\\*|\\/)';
my $regex = qr/[^a-zA-Z,]\d+((\,\d+(\+|\-|\*|\/)\d+(\,\d+|))|((\+|\-|\*|\/)(\d+(\,\d+|))))/p;
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