There are a lot of ways to skin this cat:
Both of these use $ at the end to anchor the regex to the end of the string. The first uses .*+, the non-greedy version of .*, the second uses the character class of all chars except '.' to only get the last suffix
Another possibility is to use the perl module File::Basename and this is probably the best way, because you don't need to worry about getting it right, someone else did that already
UPDATE: kennethk is right, the first version doesn't work. Obviously the regex engine never matches from right to left even when anchored to the right
UPDATE2: Seems to be not my day. 3 errors in two lines is quite depressing
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