Java regex 程式匹配括號“(”或“)”。
下列正則表示式接受帶括號的字串−
"^.*[\(\)].*$";
^ 匹配句子的開頭。
.* 匹配零個或多個(任何)字元。
[\(\)] 匹配括號。
$ 表示句子的結尾。
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");
}
}
}輸出 1
Enter data: sample(text) with parenthesis Input accepted
輸出 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");
}
}
}輸出 1
Enter email address: sample(text) with parenthesis Valid match
輸出 2
Enter email address: sample text Invalid match
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