Java 中的正则表达式元字符“w”

子表达式/元字符“\w”匹配单词字符，即从 a 到 z 和从 A 到 Z 及从 0 到 9 的字符。

示例 1

import 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);
   }
}

输出

Number of matches: 1

Learn Java in-depth with real-world projects through our Java certification course. Enroll and become a certified expert to boost your career.

示例 2

以下示例读取 5 个字符串值，并打印包含单词字符的值 -

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatchWordCharacters {
   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();
      }
      //Creating a Pattern object
      Pattern p = Pattern.compile(regex);
      System.out.println("Strings that contain word characters: ");
      for(int i=0; i<5;i++) {
         //Creating a Matcher object
         Matcher m = p.matcher(input[i]);
         if(m.matches()) {
            System.out.println(m.group());
         }
      }
   }
}

输出

Enter 5 input strings:
sample
test
test23
hello##
#$%&&
Strings that contain word characters:
sample
test
test23
hello##

更新于： 2019-11-19

185 次观看

开启您的 职业生涯

完成课程并获取认证

开始
广告