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it is not very good idea but if you really need to create variables on-the-run here's the code:

for (i = 0; i < feeds.length; i++) 
{
 var feed = feeds[i];
 window[feed.substring(0, feed.indexOf(":"))] = feed.match(/\d+$/);
}
alert(test_user_201508_20150826080829)

Of course you cannot have any variable-name-string containing banned signs (like '.')

Regards, Michał