(?: re) 子表达式在 Java 正则表达式中
子表达式/元字符“(?: re)”对正则表达式进行分组,但不记住匹配的文本。
示例
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PatternExample {
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.next();
String regex = "(?:[0-9])";
//Compiling the regular expression
Pattern pattern = Pattern.compile(regex);
//Retrieving the matcher object
Matcher matcher = pattern.matcher(input);
//verifying whether match occurred
boolean bool = matcher.find();
if(bool) {
System.out.print("Match found");
} else {
System.out.print("Match not found");
}
}
}输出
Enter a String 9848022338 Match found
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