Posix 字符类 p{Lu} Java 正则表达式\
javaobject oriented programmingprogramming更新于 2024/8/1 10:14:00
此类 \p{Lu} 匹配大写字母。
示例 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example1 {
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{Lu}";
//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("大写字符数: "+count);
}
}
输出
输入字符串 Hello HOW are YOU 大写字符数: 7
示例 2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example2 {
public static void main(String args[]) {
//匹配小写字母的正则表达式
String regex = "^.*\p{Lu}.*$";
//获取输入数据
Scanner sc = new Scanner(System.in);
System.out.println("请输入5个字符串: ");
String input[] = new String[5];
for (int i=0; i<5; i++) {
input[i] = sc.nextLine();
}
//创建一个 Pattern 对象
Pattern p = Pattern.compile(regex);
System.out.println("带有拉丁字符的字符串: ");
for(int i=0; i<5;i++) {
//创建 Matcher 对象
Matcher m = p.matcher(input[i]);
if(m.matches()) {
System.out.println(m.group());
}
}
}
}
输出
请输入5个字符串: hello how are you This is SAMPLE text 123 465 TEST DATA #$% &# *# 带有拉丁字符的字符串: This is SAMPLE text TEST DATA
