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حرف التسلسل "\ W" في تعبيرات النصوص العادية Java

子表达式/元字符“ \ W ”与非单词字符匹配。

例1

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexExample {
   public static void main(String args[]) {
      String regex = "\\W!";
      String input = "您好,欢迎来到w3codebox!";
      Pattern p = Pattern.compile(regex);
      Matcher m = p.matcher(input);
      int count = 0;
      while(m.find()) {
         count++;
      }
      System.out.println("Number of matches: "+count);
   }
}

Output result

Number of matches: 1

Example 2

The following example reads 5 string values and prints the values containing non-word characters-

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
   public static void main( String args[] ) {
      String regex = "\\W.*$";
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter 5 input strings:");
      String input[] = new String[5];
      for (int i = 0; i < 5; i++) {
         input[i] = sc.nextLine();
      }
      // Create a Pattern object
      Pattern p = Pattern.compile(regex);
      System.out.println("Strings that contain non-word characters:");
      for(int i = 0; i < 5; i++) {
         // Create a Matcher object
         Matcher m = p.matcher(input[i]);
         if(m.matches()) {
            System.out.println(m.group());
         }
      }
   }
}

Output result

Enter 5 input strings:
$hello
sample
test1
test2
#$&*
Strings that contain non-word characters:
$hello
#$&*
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