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    <p>Ok, I think I got it... These are the changes I made:</p> <ul> <li>The bottom five selectors have a capital "E" and should all be "containsRegex()"</li> <li><p>I changed the containsRegex a tiny bit by adding a "reg" check in the return, to make it more sturdy:</p> <pre><code>containsRegex: function(a,i,m){ var regreg = /^\/((?:\\\/|[^\/])+)\/([mig]{0,3})$/, reg = regreg.exec(m[3]); return reg ? RegExp(reg[1], reg[2]).test($.trim(a.innerHTML)) : false; } </code></pre></li> <li><p>All escaped characters in the regex need to be double escaped ( i.e. <code>\(</code> needs to be <code>\\(</code> )</p></li> <li><p>I removed all the single quotes to actually help me from being distracted</p></li> <li><p>I removed the class name numbers. I know ID's shouldn't start with numbers and I'm pretty sure class names shouldn't start or only be a number either. Anyway, this led to some selectors adding the same regex (i.e. "x" and "-" look the same, as well as "x*(mb)" and "X*(mb)" with the css in the demo).</p></li> </ul> <p>Anyway, I'll update my gist with this code and your <a href="http://jsfiddle.net/Mottie/w3C3Q/2/">demo</a>:</p> <pre><code>/* jQuery selector to match exact text inside an element * :containsExact() - case insensitive * :containsExactCase() - case sensitive * :containsRegex() - set by user ( use: $(el).find(':containsRegex(/(red|blue|yellow)/gi)') ) */ $.extend($.expr[':'],{ containsExact: function(a,i,m){ return $.trim(a.innerHTML.toLowerCase()) === m[3].toLowerCase(); }, containsExactCase: function(a,i,m){ return $.trim(a.innerHTML) === m[3]; }, containsRegex: function(a,i,m){ var regreg = /^\/((?:\\\/|[^\/])+)\/([mig]{0,3})$/, reg = regreg.exec(m[3]); return reg ? RegExp(reg[1], reg[2]).test($.trim(a.innerHTML)) : false; } }); // -, (mb), x*, x*(mb), x, x(mb), X*, X*(mb), X $("td:containsRegex(/^[xtfv]$/)").addClass("queue"); // x $("td:containsRegex(/^[xtfv]\\*$/)").addClass("queue review"); // x* $("td:containsRegex(/^\\([a-z]{2}\\)$/)").addClass("active"); // (mb) $("td:containsRegex(/^[xtfv]\\([a-z]{2}\\)$/)").addClass("active"); // x(mb) $("td:containsRegex(/^[xtfv]\\*\\([a-z]{2}\\)$/)").addClass("active review"); // x*(mb) $("td:containsRegex(/^[XTFV]$/)").addClass("done"); // X $("td:containsRegex(/^[XTFV]\\*$/)").addClass("queue review"); // X* $("td:containsRegex(/^[XTFV]\\*\\([a-z]{2}\\)$/)").addClass("active review"); // X*(mb) $("td:containsExact(-)").addClass("queue"); // - </code></pre>
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    1. COOh man - that worked perfectly. I completely overlooked double escaping, which I know think I understand the logic behind. The Regex versus RegEx thing was kind of dumb for me to overlook, but I'm glad you caught it. And I appreciate changes to your `contains` extension. That's really a superb piece of code, so once again - thank you!
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    2. COI've updated [the gist](https://gist.github.com/461488) that contains this code to work with jQuery 1.8+. Note because of the changes to the `expr` function, the `:containsRegex()` function now does require quotes inside the parentheses.
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