此类\ p {Lu}与大写字母匹配。
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("Enter a string"); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); //正则表达式 String regex = "\\p{Lu}"; //Compiling the 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("Number of capital characters: "+count); } }
输出结果
Enter a string Hello HOW are YOU Number of capital characters: 7
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example2 { public static void main(String args[]) { //正则表达式 to match lower case letters String regex = "^.*\\p{Lu}.*$"; //获取输入数据 Scanner sc = new Scanner(System.in); System.out.println("Enter 5 input strings: "); String input[] = new String[5]; for (int i=0; i<5; i++) { input[i] = sc.nextLine(); } //创建一个Pattern对象 Pattern p = Pattern.compile(regex); System.out.println("Strings with Latin characters: "); for(int i=0; i<5;i++) { //创建一个Matcher对象 Matcher m = p.matcher(input[i]); if(m.matches()) { System.out.println(m.group()); } } } }
输出结果
Enter 5 input strings: hello how are you This is SAMPLE text 123 465 TEST DATA #$% &# *# Strings with Latin characters: This is SAMPLE text TEST DATA