How to check each of the character inside a string

Question

As I have mentioned on the title above I need to know how to check each of the characters inside a String as follows:

1. check if the string is less than 3 character.
2. check if the string contains digits.
3. check if a single word of string has no vowels.

I've been searching for the exact example but I couldn't find one.

Answer 1

Follow those steps:

String s = "mystring";
s.length() < 3 // expression which says if it's smaller than 3.
s.matches(".*[0-9].*") //expression which says if there are digits in the string
s.matches("\b[^aeiouAEIOU ]+\b") //expression which says if there are no vovels

To check if yourString matches all those conditions:

if (myString.length() < 3 && myString.matches(".*[0-9].*") 
    && myString.matches("\b[^aeiouAEIOU ]+\b")) {
   //matches all
}