java - How to test if a String contains both letter and number

Question

I need a regex which will satisfy both conditions.

It should give me true only when a String contains both A-Z and 0-9.

Here\'s what I\'ve tried:

Answer 1

It easier to write and read if you use two separate regular expressions:

String s  =  "blah-FOO-test-1-2-3";

String numRegex   = ".*[0-9].*";
String alphaRegex = ".*[A-Z].*";

if (s.matches(numRegex) && s.matches(alphaRegex)) {
    System.out.println("Valid: " + input);
}

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Better yet, write a method:

public boolean isValid(String s) {
    String n = ".*[0-9].*";
    String a = ".*[A-Z].*";
    return s.matches(n) && s.matches(a);
}