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Regular Expression:

\[uid\](.*?)\[/uid\]

Replacement:

<a href="http://justinbytes.com/member.php?action=profile&uid=$1">Click to go too UID: $1</a>

You do really not want to allow any kind of input (the .*?) as then a user could simply [uid]" style="background: red" [/uid] (and worse)

As uids are just integers just use \d which accepts 0-9

As,

\[uid\](\d+)\[/uid\]