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    <p>Pass it a closure that will handle it when you're done.</p> <pre><code>function replacer(match) { if (isYoutubeLink()) { getYoutubeEmbedCode(function(){//code to change URLs here}); } // repeat for other types of urls } </code></pre> <p>I would not structure my code exactly like this, I would abstract that closure to a variable that is visible to the scope of the call but this is for succinctness.</p> <p>--Edit--</p> <p>After more though I realize that this is not the approach you want to use at all. You're looking to replace the links (anchor tags) themselves, not the href attributes on them.</p> <p>1) Select all of the anchor tags you expect to change into youtube videos and store them in an array. This is easy if you give them all a class or data-attribute (I prefer data-attribute in this case since it makes comparison easier and less likely to collide with basic css classes).</p> <p>2) Loop through them, and compare their href values or their data-attribute names (&lt;--that's the advantage of using data-attribute) to decide which youtube vid to pull on a per-element basis. Pass the ajax call a callback function (a closure as I mentioned in my original post) that is passed the target anchor tag.</p> <p>3) Use the target anchor tag when the ajax comes back to place the youtube code after it (using append or something of the sort).</p> <p>4) remove the target anchor tag.</p> <p>5) now that you want to add something after the video, since you have the video here, you can do it now by targeting it.</p> <p>All done.</p> <p>This is a better approach in my opinion. Maybe I am missing the point of your post but from what I read it sounds to me like your approach is trying to do something other than what you really want to do.</p>
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    1. POReplacing urls with embed code
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    1. COWhy downvote? This isn't a bad solution. He just modifies the code in getYoutueEmbedCode to call the passed closure.... I wish people would state WHY they downvote.
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    2. COSo how exactly can he return the result from `replacer`?
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    3. COThe question is "how can I change the URLs"- you dont need to return a result from replacer. Pass a closure, and the closure handles updating the URLs. A perfectly (and widely used) viable solution. If you agree with that please remove your downvote because I strongly disagree with it.
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