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copied!<p>Assuming that your given regular expression is a <a href="http://msdn.microsoft.com/en-us/library/az24scfc.aspx" rel="nofollow">.NET regular expression</a>, the following syntax components are not supported by JavaScript:</p> <ul> <li><code>(?>…)</code> – <a href="http://msdn.microsoft.com/en-us/library/bs2twtah.aspx#nonbacktracking_subexpression" rel="nofollow">nonbacktracking subexpression</a> </li> <li><code>(?<name>…)</code> – <a href="http://msdn.microsoft.com/en-us/library/bs2twtah.aspx#named_matched_subexpression" rel="nofollow">named matched subexpressions</a></li> <li><code>(?<name1-name2>…)</code> – <a href="http://msdn.microsoft.com/en-us/library/bs2twtah.aspx#balancing_group_definition" rel="nofollow">balancing group definition</a></li> <li><code>(?(name)…)</code> – <a href="http://msdn.microsoft.com/en-us/library/36xybswe.aspx#Conditional_Group" rel="nofollow">conditional group</a></li> </ul> <p>To get the same result with JavaScript, you’ll need to do the balancing on your own:</p> <pre><code>var parts = str.match(/[()]|[^()]+/g), matches = [], balance = 0; for (var i=0, j=0; i<parts.length; i++) { switch (parts[i]) { case "(": if (balance === 0) { j = i; } balance++; break; case ")": if (balance === 1) { matches.push(parts.slice(j, i+1).join("")); } balance--; if (balance < 0) { throw new EvalError('parentheses are not balanced; unexpected "("'); } break; } } if (balance > 0) { throw new EvalError('parentheses are not balanced; missing ")"'); } </code></pre>

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