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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