language: JavaScript (spidermonkey) (spidermonkey-1.7)
date: 320 days 14 hours ago
link:
visibility: public 
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var oldSid = new RegExp('sid=[0-9]{1,5}x[0-9]{1,5}'); 
var newSid = 'sid=500x500';
var oldUrl = 'media.php?sid=200x100&mid=100x100';
var newUrl = oldUrl.replace(oldSid, newSid);
print(newUrl);