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  1. Prepare
  2. Regex
  3. Backreferences
  4. Backreferences To Failed Groups
  5. Discussions

Backreferences To Failed Groups

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176 Discussions

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  • lari_fossato
     + 1 comment

    Regex_Pattern = r"\d{8}|^(\d\d)(-\d\d){2}-(\d\d)$"

  • tdkhoa73
     + 0 comments

    ^\d{2}(-?)\d{2}(\1\d{2}){2}$

  • ashutoshpatel028
     + 1 comment

    ^(\d\d)(\-?)\1\2\1\2\1$

    why this wont work in JAVA? Group1 = (\d\d) Group2 = (\-?)

  • preethiannjacob
     + 0 comments

    Java 15:

    import java.io.*;
import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class Solution {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Pattern pattern = Pattern.compile("^\\d{2}(-?)(\\d{2}\\1){2}\\d{2}$");
        Matcher matcher = pattern.matcher(scanner.nextLine());
        System.out.println(matcher.find());
    }
}

  • satyam_abhinav
     + 0 comments

    This is what i used: ^\d{2}(\-?)\d{2}\1\d{2}\1\d{2}$