Posix 字符类 p{XDigit} Java 正则表达式。
此类匹配十六进制字符,即 [0-9a-fA-F]。
示例 1
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class SpaceCharacters { 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{XDigit}]"; //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 hexadecimal characters: "+count); } }
输出
Enter a string Bb12\tc! Number of hexadecimal characters: 5
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{XDigit}.*$"; //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 hexa decimal 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: sample 123 xyz @## DEF01 Strings with hexadecimal characters: sample 123 DEF01
广告