use strict;
my $str = 'captures up to singly-nested blocks:
p{1} = \\{(?:[^{}])*\\}
int main() {
return 0;
}
captures up to doubly-nested:
p{2} = \\{(?:(?:p{1})|(?:[^{}]))*\\}
...or...
p{2} = \\{(?:(?:\\{(?:[^{}])*\\})|(?:[^{}]))*\\}
void more_complex_fxn(int z) {
int x = z / 9;
if (x > 3) {
do_something;
x += 5;
}
}
Following the pattern set above...
up to triply-nested:
p{3} = \\{(?:(?:p{2})|(?:[^{}]))*\\}
...or...
p{3} = \\{(?:(?:\\{(?:(?:\\{(?:[^{}])*\\})|(?:[^{}]))*\\})|(?:[^{}]))*\\}
double so_many_blocks(double x) {
double y = x;
while(y > 4) {
if (y < 6) {
y -= 0.3;
} else {
y -= 0.5;
}
}
return y;
}';
my $regex = qr/\{(?:(?:\{(?:(?:\{(?:[^{}])*\})|(?:[^{}]))*\})|(?:[^{}]))*\}/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