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criswell
on Dec 20, 2013
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Regex Golf
[a-f]{4,} works as well... but I do like your solution!
danielsamuels
on Dec 20, 2013
[–]
[a-f]{4} is shorter.
josephlord
on Dec 20, 2013
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parent
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^[a-f]*$
Is the same length too.
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