Java 中的正则表达式“W”元字符
子表达式/元字符“\W”匹配非单词字符。
示例一
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexExample {
public static void main(String args[]) {
String regex = "\W!";
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
示例二
以下示例读取 5 个字符串值,并打印那些包含非单词字符的值:
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();
}
//Creating a Pattern object
Pattern p = Pattern.compile(regex);
System.out.println("Strings that contain non-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: $hello sample test1 test2 #$&* Strings that contain non-word characters: $hello #$&*
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