Posix 字符类 p{Punct} Java 正则表达式
javaobject oriented programmingprogramming更新于 2025/2/2 9:16:17
此类匹配标点符号。即!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
示例 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class AlphanumericExample {
public static void main(String args[]) {
//从用户读取字符串
System.out.println("输入字符串");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
//正则表达式
String regex = "[\p{Punct}]";
//编译正则表达式
Pattern pattern = Pattern.compile(regex);
//检索匹配器对象
Matcher matcher = pattern.matcher(input);
int count = 0;
while(matcher.find()) {
count++;
}
System.out.println("标点符号数量: "+count);
}
}
输出 1
输入字符串 Hello, how are you. Welcome to Tutorialspoint. 标点符号数量: 3
示例 2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main( String args[] ) {
//匹配小写字母的正则表达式
String regex = "^\p{Punct}+$";
//Getting the input data
Scanner sc = new Scanner(System.in);
System.out.println("请输入5个字符串: ");
String input[] = new String[5];
for (int i=0; i<5; i++) {
input[i] = sc.nextLine();
}
//创建一个 Pattern 对象
Pattern p = Pattern.compile(regex);
System.out.println("仅包含标点符号的字符串: ");
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
请输入5个字符串: hello 1234 123text.!! !!!!! ..!!,, 仅包含标点符号的字符串: !!!!! ..!!,,
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