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    <p>Matching nested parens is exceedingly simple using modern patterns. Not counting whitespace, this sort of thing: </p> <pre><code>\( (?: [^()] *+ | (?0) )* \) </code></pre> <p>works for mainstream languages like Perl and PHP, plus anything that uses PCRE.</p> <p>However, you really need <strong>grammatical regexes</strong> for a full parse, or you’ll go nuts. Don’t use a language whose regexes don’t support breaking regexes down into smaller units, or which don’t support proper debugging of their compilation and execution. Life’s too short for low-level hackery. Might as well go back to assembly language if you’re going to do that.</p> <p>I’ve written about recursive patterns, grammatical patterns, and parsing quite a bit: for example, see <a href="https://stackoverflow.com/questions/4840988/the-recognizing-power-of-modern-regexes/4843579#4843579">here for parsing approaches</a> and <a href="https://stackoverflow.com/questions/4231382/regular-expression-pattern-not-matching-anywhere-in-string/4234491#4234491">here for lexer approaches</a>; also, the <a href="https://stackoverflow.com/questions/4246077/simple-problem-with-regular-expression-only-digits-and-commas/4247184#4247184">final solution here</a>.</p> <p>Also, Perl’s <a href="http://search.cpan.org/~dconway/Regexp-Grammars/lib/Regexp/Grammars.pm" rel="nofollow noreferrer"><code>Regexp::Grammars</code> module</a> is especially useful in turning grammatical regexes into parsing structures.</p> <p>So by all means, go for it. You’ll learn a lot that way.</p>
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