use strict;
my $str = '$test($test(test &var1 $var2) $test(jean) jean) # should full-match
$test($test(test $var1 $var2) $test(foo) bar) # should not full-match
$test("&test") # should not full-match
$test("foo&test") # should not full-match
$test("&test" &test) # should full-match
&test # should full-match
$test(" &test") # should not full-match
$test # should not full-match
&test(foo) # should not full-match
&test(&foo $bar()) # should not full-match
$test((&test)) # should not full-match
$foo(bar(&baz)) # should not full match
$test(&test &test) # should not full match
$test( &test) # should not full match
$test(&test ) # should not full match';
my $regex = qr/(?:\$\w+(?:\((?<arg>(?R)|(?:\"[^\"]*\")|(?:[^\$\"\&\s\(\)][^\s\(\)]*))(?:(?:\+| )(?&arg))*\))?)|(?<var>\&\w+)/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