Java Regular Expression Example

The regular expression defines the link:

Http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#sum

Application Examples:

• Count the number of words in a Java string

public class Nn {

public static void Main (string[] args) {
String str= "This is a process";
System.out.println (Str.split ("\\s+"). length);

}

• Get all uppercase letters, lowercase letters, and numbers inside the string

Class T {

public static void Main (string[] args) {

String str = "DKJLAHJKDJFDHJKS2F3H4D5FJKDS1HFURFFDASJKF775876HLDJFHUIFHDSJFDF";
System.out.println (Str.replaceall ("[^a-z]", ""));//Get all uppercase letters inside the string
System.out.println (Str.replaceall ("[^a-z]", ""));//Get all lowercase letters inside the string
System.out.println (Str.replaceall ("[^0-9]", ""));//Get all the numbers inside the string

}

}

Java Regular Expression Example