Why is the codeline below not printing what I say when the condition is true?

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if (Pattern.matches("[^a-zA-z0-9]", args[0])) System.out.println("Invalid");

Where args[0] is 12AS08Z/

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Guadalupe Gagnon

Level 37 , Tampa, United States

7 June 2021, 13:58

solution

That would only match a String of one character that is not a letter of a number. Examples of Strings that would be true in that case and print "Invalid": "%" "!" "$" Examples of Strings that would be false and not print that: "%%" "!!" "$$" (any String that had a length of zero or a length of 2 or more)

Andrei

Level 41

8 June 2021, 07:07

OK, so I need to look for a different way to format the regex. Thanks!