字符类 p{javaWhitespace} Java 正则表达式中。
此字符类 p{javaWhitespace} 匹配空格。此类匹配作为 java.lang.Character 类中的 isWhitespace() 方法的参数传递时返回 true 的字符。
示例 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{javaWhitespace}]"; //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 hello welcome to tutorialspoint Number of upper case characters: 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[] ) { //Regular expression to match lower case letters String regex = "^\p{javaWhitespace}+$"; //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
广告