Test filename with regular expression

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You could use these expressions instead:

  • \w – is the same as [a-zA-Z0-9_]
  • \d – is the same as [0-9]
  • \. – is the same as [.]{1}

Which would make your regex:

^[\w,\s-]+\.[A-Za-z]{3}$

Note that a literal dash in a character class must be first or last or escaped (I put it last), but you put it in the middle, which incorrectly becomes a range.

Notice that the last [a-zA-Z] can not be replaced by \w because \w includes the underscore character and digits.

EDITED: @tomasz is right! \w == [a-zA-Z0-9_] (confirmed here), so I altered my answer to remove the unnecessary \d from the first character class.

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