https://issues.dlang.org/show_bug.cgi?id=13422

          Issue ID: 13422
           Summary: std.ascii has isAlphaNum but std.uni doesn't
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: Phobos
          Assignee: nobody@puremagic.com
          Reporter: turkeyman@gmail.com

std.ascii and std.uni both have isAlpha, and it'd be nice if they both had isAlphaNum as well.

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