如何使用Java RegEx匹配单词字符？
英文字母（均为大小写）和数字（0到9）被视为单词字符。您可以使用元字符“\w”来匹配它们。
例子1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
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();
String regex = "^\\w{5}";
//编译正则表达式
Pattern pattern = Pattern.compile(regex);
//检索匹配器对象
Matcher matcher = pattern.matcher(input);
if(matcher.find()) {
System.out.println("Match occurred");
} else {
System.out.println("Match not occurred");
}
}
}输出1
Enter a String hello Match occurred
输出2
Enter a String #how Match not occurred
例子2
import java.util.Scanner;
public class RegexExample {
public static void main( String args[] ) {
//接受文字的正则表达式
String regex = "\\w*";
System.out.println("Enter input value: ");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
boolean bool = input.matches(regex);
if(bool) {
System.out.println("match occurred");
} else {
System.out.println("match not occurred");
}
}
}输出结果
Enter input value: *##& match not occurred