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-isalpharune, islowerrune, isspacerune, istitlerune, isupperrune, tolowerrune, totitlerune, toupperrune \- Unicode character classes and cases
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+isalpharune, islowerrune, isspacerune, istitlerune, isupperrune, isdigitrune, tolowerrune, totitlerune, toupperrune \- Unicode character classes and cases
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