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POjquery match() variable interpolation - complex regexes
 

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    <p>I've already looked at <a href="https://stackoverflow.com/questions/1695633?sort=newest#sort-top">this</a>, which was helpful to a point.</p> <p>Here's the problem. I have a list of users propagated into an element via user click; something like this:</p> <pre><code>&lt;div id="box"&gt; joe-user page-joe-user someone-else page-someone-else &lt;/div&gt; </code></pre> <p>On click, I want to make sure that the user has not already been clicked into the div. So, I'm doing something like: </p> <pre><code>if ( ! $('#box').html().match(rcpt) ) { update_div(); } else { alert(rcpt+' already exists.'); } </code></pre> <p>However, with existing lack of interpolation that javascript has for regular expressions, is causing my alert to trigger in the use-case where <code>page-joe-user</code> is selected and then the user selects <code>joe-user</code>, which are clearly not exactly the same.</p> <p>In Perl I would do something like:</p> <pre><code>if ( $rcpt =~ /^\Qrcpt\E/ ) { # code } </code></pre> <p>All I want to do is change my match() to be:</p> <pre><code>if ( ! $('#box').html().match(/^rcpt/) ) { # code } </code></pre> <p><code>if ( ! $('#box').html().match(rcpt) )</code> seemed a little promising but it, too, fails. Using <code>new RegExp()</code> also does not work using concatenation of complex RE syntax within the function IE <code>$('#box').html().match(new RegExp('^'+rcpt))</code>. I also tried <code>$('#box').html().match('/^'+rcpt'/')</code>. I can only imagine that I'm missing something. I'm pretty new to javascript.</p> <p>I don't seem to be able to find anything that really addresses such a use-case, here on this site.</p> <p>TIA</p>
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