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The subexpression/metacharacter “\W” matches the non-word characters.Example1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main(String args[]) { String regex = "\W!"; String input = "Hello how are you welcome to Tutorialspoint !"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }OutputNumber of matches: 1Example2Following example reads 5 string values and prints those that contain ... Read More
The subexpression/metacharacter “\w” matches the word characters i.e. a to z and A to Z and 0 to 9.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "\w to"; String input = "Hello how are you welcome to Tutorialspoint"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); ... Read More
The subexpression/metacharacter “a| b” matches either a or b.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "Hello|welcome"; String input = "Hello how are you welcome to Tutorialspoint"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }OutputNumber of matches: 2Example 2The following Java program reads gender ... Read More
The subexpression/metacharacter “re{ n, m}” matches at least n and at most m occurrences of the preceding expression.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "xyy{2, 4}"; String input = "xxyyzxxyyyyxyyzxxyyzz"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }OutputNumber of matches: 1Example 2The following ... Read More
The subexpression/metacharacter “re{ n}” matches exactly n number of occurrences of the preceding expression.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "to{1}"; String input = "Welcome to Tutorialspoint"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }OutputNumber of matches: 2Example 2Following Java program reads age ... Read More
The subexpression/metacharacter “re+” matches one or more occurrences of the preceding expression.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "aabc+"; String input = "aabcabcaabcabbcaabcbcaabc"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }OutputNumber of matches: 4Example 2import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Test ... Read More
The subexpression/metacharacter “\z” matches the end of a string.Example1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "Tutorialspoint\z"; String input = "Hi how are you welcome to Tutorialspoint"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }OutputNumber of matches: 1Example2The following Java program verifies whether the given ... Read More
The subexpression/metacharacter “\Z” matches the end of the entire string except allowable final line terminator.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "Tutorialspoint\z"; String input = "Hi how are you welcome to Tutorialspoint"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }OutputNumber of matches: 1Example ... Read More
The subexpression/metacharacter “\A” matches the beginning of the entire string.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "\AHi"; String input = "Hi how are you welcome to Tutorialspoint"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }OutputNumber of matches: 1Example 2Following Java program accepts a ... Read More
The subexpression/metacharacter “[^...]” matches any single character, not in brackets.Example 1import java.util.regex.Matcher; import java.util.regex.Pattern; public class SpecifiedCharacters { public static void main( String args[] ) { String regex = "[^hwtyoupi]"; String input = "Hi how are you welcome to Tutorialspoint"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }OutputNumber of matches: 21Example 2The following Java program accepts ... Read More