字符类 p{javaUpperCase} Java 正则。
此字符类 \p{javaUpperCase} 匹配大写字母。当作为参数传递给 java.lang.Character 类的 isUpperCase() 方法后,此类将匹配返回值为 true 的字符。
例子 1
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main(String args[]) { //Reading String from user System.out.println("Enter a string"); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); //Regular expression String regex = "[\p{javaUpperCase}]"; //Compiling the regular expression Pattern pattern = Pattern.compile(regex); //Retrieving the matcher object Matcher matcher = pattern.matcher(input); int count = 0; while(matcher.find()) { count++; } System.out.println("Number of upper case characters: "+count); } }
输出
Enter a string This IS A sample TExt Number of lower case characters: 6
例子 2
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main( String args[] ) { //Regular expression to match lower case letters String regex = "^\p{javaUpperCase}+$"; //Getting the input data 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 with only upper case 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: Raju RAMU rahman radha SUnDar* Strings with only upper case characters: RAMU
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