使用Regex过滤Java中的单词

Question

I have a message that comes into the Android Device as text message which I read when it comes in like this Your OTP verification code is 5M67BX the OTP code isn't fixed. It varies, if it were to be like that I'll just use a Regex Pattern of ([0-9]){1}([AZ]){1}([0-9]){2}([AZ]){1} But, it isn't always like that. Sometimes all numbers. If you can share Pattern to filter the code out in Java would be appreciated. Thanks

Answer 1

If it is always a fixed length (6) and always at the end of the String, you could do:

String s = "Your OTP verification code is 5M67BX";
String otpCode = s.substring(s.length() - 6);

Edit: With Regex this time...

String s = "Your OTP verification code is 5M67BX";  
String s2 = "Your updated OTP code is YW32R2 for phone verification";

Pattern p = Pattern.compile("([A-Z0-9]){6}");
Matcher m = p.matcher(s);
if (m.find()) {
    System.out.println(m.group());
}
m = p.matcher(s2);
if (m.find()) {
    System.out.println(m.group());
}

Which outputs...

5M67BX
YW32R2