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Sie können den Metazeichen " \\ DPassen Sie nicht-numerische Zeichen
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String args[]) { //Lesen Sie einen String vom Benutzer System.out.println("Geben Sie einen String ein"); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); String regex = "\\D"; //Compile regular expression Pattern pattern = Pattern.compile(regex); //Search matcher object Matcher matcher = pattern.matcher(input); int count = 0; while(matcher.find()) { count++; } System.out.println("Number non-digit characters: "+count); } }
Output result
Enter a String sample text 2425 36 Number non-digit characters: 13
import java.util.Scanner; public class RegexExample { public static void main(String args[]) { //Regular expressions accept5words with letters String regex = "\\D{10}; System.out.println("Enter input value:"); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); boolean result = input.matches(regex); if(result) { System.out.println("input matched"); } else { System.out.println("wrong input"); } } }
Enter input value: sample abc input matched
Enter input value: sample1234 wrong input