This character class \p{javaUpperCase} matches upper case letters. This class matches the characters which returns true when passed as a parameter to the isUpperCase() method of the java.lang.Character class.Example 1 Live Demoimport java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample {    public static void main(String args[]) {       ... Read More

This character class \p{javaLowerCase} matches lower case letters. This class matches the characters which returns true when passed as a parameter to the isLowerCase() method of the java.lang.Character class.Example 1 Live Demoimport java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample {    public static void main(String args[]) {       ... Read More

This class matches white space characters. i.e. \t, , \x, 0B, \f, \r.Example 1 Live Demoimport java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class SpaceCharacters {    public static void main(String args[]) {       //Reading String from user       System.out.println("Enter a string");       Scanner sc = ... Read More

This class matches hexa-decimal characters i.e. [0-9a-fA-F].Example 1 Live Demoimport java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class SpaceCharacters {    public static void main(String args[]) {       //Reading String from user       System.out.println("Enter a string");       Scanner sc = new Scanner(System.in);       String ... Read More

This class matches all the printable characters.Example 1 Live Demoimport java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class PrintableCharacters {    public static void main(String args[]) {       //Reading String from user       System.out.println("Enter a string");       Scanner sc = new Scanner(System.in);       String ... Read More

This class matches all visible characters i.e. alphabets, digits, punctuation marks.Example 1 Live Demoimport java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class VisiblieCharacters {    public static void main(String args[]) {       //Reading String from user       System.out.println("Enter a string");       Scanner sc = new Scanner(System.in); ... Read More

This class matches punctuation marks. i.e.!"#$%&'()*+, -./:;?@[\]^_`{|}~Example 1 Live Demoimport java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class AlphanumericExample {    public static void main(String args[]) {       //Reading String from user       System.out.println("Enter a string");       Scanner sc = new Scanner(System.in);       String ... Read More

This class matches alphabetic characters both upper case and smaller case.Example 1 Live Demoimport java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example {    public static void main( String args[] ) {       //Regular expression to match lower case letters       String regex = "^\p{Alpha}+$";     ... Read More

This class matches the upper case alphabetic characters.Example 1import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Posix_LowerExample {    public static void main( String args[] ) {       //Regular expression to match upper case letters       String regex = "^\p{Upper}+$";       //Getting the input ... Read More

The compile method of the patter class accepts two parameters −A string value representing the regular expression.An integer value a field of the Pattern class.This CASE_INSENSITIVE field of the Pattern class matches characters irrespective of case. Therefore, if you pass as flag value to the compile() method along with your ... Read More