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copied!<p>Just in case you won't succeed in finding a sufficient regex, may I suggest a JavaScript parser generator like <a href="http://pegjs.majda.cz/" rel="nofollow">PEG.js</a>*. There's an <a href="http://pegjs.majda.cz/online" rel="nofollow">online version</a> of PEG.js that allows you to tinker with the grammar, then download the parser once satisfied with the result.</p> <p>[ * ] PEG - <a href="http://en.wikipedia.org/wiki/Parsing_expression_grammar" rel="nofollow">Parsing Expression Grammar</a></p> <p>For help with the grammar you should consult the <strike><a href="http://www.w3.org/TR/css3-syntax" rel="nofollow">W3C's working draft on CSS3 syntax</a></strike> <a href="http://www.w3.org/TR/css3-selectors/#w3cselgrammar" rel="nofollow">W3C's recommendation on Selectors Level 3</a>.</p> <p>I took the time and played around and came up with a reduced grammar for a single selector (element/id/attr/class/pseudo). You'd want to go over it and refine it here and there, probably.</p> <pre><code>/* * PEG.js grammar */ start = element? hash? (class / attr / pseudo)* element = '*' / ident ident = i:(nmstart) j:(nmchar*) {return i + j.join('');} hash = h:('#' ident) {return h.join('');} class = c:('.' ident) {return c.join('');} attr = a:('[' (b:[^\]]+ {return b.join('');}) ']') {return a.join('');} pseudo = p:(':' function) {return p.join('');} nmstart = [a-z] / nonascii nmchar = [a-z0-9-] / nonascii function = f:(ident '(' body ')') {return f.join('');} body = b:[^\)]+ {return b.join('');} nonascii = [\x80-\xff] _ = [ \t\n\r]+ {return '';} </code></pre>

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