Java 中的正則表示式元字元“w”
子表示式/元字元“\w”匹配單詞字元,即從 a 到 z 和從 A 到 Z 及從 0 到 9 的字元。
示例 1
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexExample {
public static void main( String args[] ) {
String regex = "\w to";
String input = "Hello how are you welcome to Tutorialspoint";
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(input);
int count = 0;
while(m.find()) {
count++;
}
System.out.println("Number of matches: "+count);
}
}輸出
Number of matches: 1
示例 2
以下示例讀取 5 個字串值,並列印包含單詞字元的值 -
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatchWordCharacters {
public static void main( String args[] ) {
String regex = "\w.*$";
Scanner sc = new Scanner(System.in);
System.out.println("Enter 5 input strings: ");
String input[] = new String[5];
for (int i=0; i<5; i++) {
input[i] = sc.nextLine();
}
//Creating a Pattern object
Pattern p = Pattern.compile(regex);
System.out.println("Strings that contain word characters: ");
for(int i=0; i<5;i++) {
//Creating a Matcher object
Matcher m = p.matcher(input[i]);
if(m.matches()) {
System.out.println(m.group());
}
}
}
}輸出
Enter 5 input strings: sample test test23 hello## #$%&& Strings that contain word characters: sample test test23 hello##
廣告
資料結構
網路
關係資料庫管理系統
作業系統
Java
iOS
HTML
CSS
Android
Python
C 語言
C++
C#
MongoDB
MySQL
Javascript
PHP