find a 6 digit number in String

Question

I've a String from a SMS like:

"Your code: 123456. Your reference number is 012. The total amount is E 1250,00.."

Now I need to extract the code '123456', which is different every time, but always 6 digits.

How can I extract this 6 digit number from the string? Can I use Regex expressions somehow? I need to be sure, so I don't want to split on 'code: ' for example.

EDIT: The rest of the text can be different, but there will be only 6 digits in the SMS.

Answer 1

The regexpr for a 6 digit number is

\d{6}

Edit: The code will look like

public static String extractDigits(final String in) {
   final Pattern p = Pattern.compile( "(\\d{6})" );
   final Matcher m = p.matcher( in );
   if ( m.find() ) {
     return m.group( 0 );
   }
   return "";
 }