Question

I try to match a regex with java and can’t find the right regex

I want to match =?utf-8?B?XXXXXXXX=?= in

=?utf-8?B?UmVtaW5kZXI=?=

I tried :

s.matches("=\\?utf\\-8\\?B\\?.*=\\?=");
s.matches("=\\?utf-8\\?B\\?.*=\\?=");

Answer 1

Are you sure? Which version of Java are you using?

I’ve made a basic test with your scenario and it works…

public static void main(String[] args) {

    String input = "=?utf-8?B?UmVtaW5kZXI=?=";
    String input2 = "irege";

    String regex = "=\\?utf\\-8\\?B\\?.*=\\?=";

    System.out.println(input.matches(regex));
    System.out.println(input2.matches(regex));

}

Console output:

true
false