Regular expressions for common Java

Package Everydaypratise;import Java.util.regex.pattern;public class regexexample{public    static void main (string[ ] args)    {        //1. US identity card number        //999-99-9999        //999999999        Pattern p1 = Pattern.compile ("[0-9]{3}\\-[0-9]{ 2}\\-[0-9]{4} ");        Pattern P2 = pattern.compile ("\\d{3}\\-\\d{2}\\-\\d{4}");        Pattern p3 = Pattern.compile ("[0-9]{3}\\-?[ 0-9]{2}\\-? [0-9] {4} ");        Pattern P4 = Pattern.compile ("\\d{3}\\-?\\d{2}\\-?\\d{4}");                2. US license plate number        //4321AW        Pattern P5 = Pattern.compile ("\\d{4}[a-z]{2}");                3. All words except the beginning of X are        Pattern P6 = Pattern.compile ("[^x][a-z]*");}    }

　　

Regular expressions for common Java