Regular Expression shielding mobile phone numbers

Today, I saw someone asking on the forum how to block the mobile phone number. In fact, using the regular expression library in JDK can be a good solution.
Below is my write BlockingProgram:

Import java. util. RegEx .*;

Public class replacetel {
Public static void main (string [] ARGs) throws exception {
Pattern P = pattern. Compile ("13 [0-9] {9 }");
Matcher M = P. matcher ("Your Tel is: 13331239924; but my is 13347215555 ");
String result = M. replaceall ("xxxxxxxxxxx ")
System. Out. println (result );
}
}