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Comment by dmitrygr | Hacker News Reader

> 8 Best Techniques for Evaluating Character

    isalnum()
    isalpha()
    iscntrl()
    isdigit()
    isgraph()
    islower()
    isprint()
    ispunct()

To be pedantic, those are methods, not techniques.

hahaha to you both (after reading dozens and dozens of serious replies)