The best way, like DeMo suggested, is to make it comma seperated , or perhaps with a more common way. Although I would suggest that, for the users sake, a comma and a space like in meta tags is the best way.

alan, cit, alancit, talkphp, respawn

First you would make the user enter their information. Then you would split it on the space-comma value and make the array filter out all sorts of invalid chars, like quotes and slashes. Do not add slashes, since I had difficulty with the search when I did.

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