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
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##
广告
数据结构
网络
关系数据库管理系统
操作系统
Java
iOS
HTML
CSS
Android
Python
C 语言
C++
C#
MongoDB
MySQL
Javascript
PHP