Regular Expression fails to matches() pattern with asterisk sign

Question

The sample code:

    String test = \"Z\";
    Pattern pt = Pattern.compile(\"[0-9]*\");
    Matcher mc = pt.matcher(test);
    System.out.println(mc.find());
            


        

Answer 1

because Z is not in the class [0-9]*(This should matches only the digits between 0 to 9 check the demo regex), to match Z it should be in the class [0-9Z]* (demo regex)

Pattern pt = Pattern.compile("[0-9Z]*");