Regular expressions verify QQ numbers

Package Regular expression;/* verification requirements for QQ numbers 5 ~ 15 digits. It cannot start with 0 and can only be numbers */import java. util. regex. matcher; import java. util. regex. pattern; public class Test {public static void main (String [] args) {// TODO Auto-generated method stubString qq = "23412312 "; string regex = "[1-9] [0-9] {4, 14}"; // A number between the first digit and the second digit, the number range is 4-14. // String regex2 = "[1-9] \ d {4, 14}"; // This sentence can also be boolean flag = qq. matches (regex); if (flag) System. out. println ("correct QQ number"); elseSystem. out. println ("incorrect QQ number ");}}

Regular expressions verify QQ numbers