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\[ - matches a square bracket (the backslash escapes it because otheriwse it will have a special meaning).

 

\w+ - matches one or more word characters

 

a single space character will match a single space character or \s will match a whitespace character, or if you wish it to be a bit more viewable [ ] will match a space. You should be able to come up with something from there. Post what you get if you can't figure it and we'll see where we can go from there.

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