Java regex 程序匹配括号“(”或“)”。
下列正则表达式接受带括号的字符串−
"^.*[\(\)].*$";
^ 匹配句子的开头。
.* 匹配零个或多个(任何)字符。
[\(\)] 匹配括号。
$ 表示句子的结尾。
示例 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class SampleTest {
public static void main( String args[] ) {
String regex = "^.*[\(\)].*$";
//Reading input from user
Scanner sc = new Scanner(System.in);
System.out.println("Enter data: ");
String input = sc.nextLine();
//Instantiating the Pattern class
Pattern pattern = Pattern.compile(regex);
//Instantiating the Matcher class
Matcher matcher = pattern.matcher(input);
//verifying whether a match occurred
if(matcher.find()) {
System.out.println("Input accepted");
}else {
System.out.println("Not accepted");
}
}
}输出 1
Enter data: sample(text) with parenthesis Input accepted
输出 2
Enter data: sample text Not accepted
示例 2
import java.util.Scanner;
public class Example {
public static void main(String args[]) {
//Reading String from user
System.out.println("Enter email address: ");
Scanner sc = new Scanner(System.in);
String e_mail = sc.nextLine();
//Regular expression
String regex = "^.*[\(\)].*$";
boolean result = e_mail.matches(regex);
if(result) {
System.out.println("Valid match");
} else {
System.out.println("Invalid match");
}
}
}输出 1
Enter email address: sample(text) with parenthesis Valid match
输出 2
Enter email address: sample text Invalid match
广告内容
数据结构
网络
RDBMS
操作系统
Java
iOS
HTML
CSS
Android
Python
C 编程
C++
C#
MongoDB
MySQL
Javascript
PHP