[:alnum:] って a-zA-Z0-9 と等価だと思っていたが違う。
てっきり
"ほげ".match(/[[:alnum:]]+/) # => nil
となるのを期待していたのに、
"ほげ".match(/[[:alnum:]]+/) # => #<MatchData "ほげ">
となる…なんだこれ？
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