Recursive Regular Expressions

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dude Permalink
December 14, 2009, 21:01

Holy cow, I thought I was pretty hot stuff with Perl. I guess with Perl you really can learn something new every day, thank you!

I'm still boggling that this works:

perl -e 'if ($ARGV[0] =~ qr/^(\(([^()]+|(?1))*\))$/) { print "Match!\n"; }'

What's the big-O performance compared to a typical recursive-descent parser?

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