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except English letters (both uppercase and lowercase) and numbers (0 to9All characters except word characters are considered non-word characters. You can use the metacharacter "\W" to match them.
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String args[]) { //Read a string from the user System.out.println("Enter a String"); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); String regex = "^\\W{5"; //Compile regular expression Pattern pattern = Pattern.compile(regex); //Retrieve matcher object Matcher matcher = pattern.matcher(input); if(matcher.find()) { System.out.println("Match occurred"); } else { System.out.println("Match not occurred"); } } }
Enter a String *&&^# Match occurred
Enter a String hello Match not occurred
import java.util.Scanner; public class RegexExample { public static void main(String args[]) { String regex = "\\W*"; System.out.println("Enter input value:"); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); boolean bool = input.matches(regex); if(bool) { System.out.println("match occurred"); } else { System.out.println("match not occurred"); } } }
Output Result
Enter input value: #*** match occurred