Throw Exception for unsupported characters

Question

I have user input

private Scanner inn = new Scanner(System.in);
String input = inn.nextLine().toLowerCase();

and i need to throw IllegalCharacterException(own exception, created this class already) for not desired input (all numerals and symbols and maybe even other languages)I need only english letters. How can i do that? Thank you.

score 0 · Accepted Answer · answered Dec 07 '19 at 20:03

0

You can use String.matches(String regex) with regular expressions. E.g.

private Scanner inn = new Scanner(System.in);
String input = inn.nextLine().toLowerCase();
if(input.matches("[a-z]*")) {
  // Do some stuff
}

The Regular expression [a-z]* matches any character from a to z (lowercase), without any numbers, symbols or spaces.

answered Dec 07 '19 at 20:03

malliaridis

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Would be nice if you mark then the answer as solution. :) – malliaridis Dec 07 '19 at 21:23
1

done it already) – Dec 07 '19 at 21:34

Throw Exception for unsupported characters

1 Answers1