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I fairly frequently match strings against regular expressions. In Java: java.util.regex.Pattern.compile ("\w+").matcher ("this_is").matches Ouch. Scala has many alternatives. "\\w+".r.pattern.matcher("this_is").matches "this_is".matches("\\w+") "\\w+".r unapplySeq "this_is" isDefined val R = "\\w+".r; "this_is" match { case R() => true; case _ => false} The first is just as heavy-weight as the ...
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