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Regex for duplicate ones | CodeAsp.Net

Regex for duplicate ones

Posted in: ASP.NET Topics  »  Getting Started / General ASP.NET
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  • peter-smith

    Hi Experts,

    I have the following string : AAAA BBB CCCC DD EEEE FFFFFFF now I want the output A B C D E F from this string with regex . How can I do it ? I am working in C#.

  •   Answered

    #region Using Directives
    using System;
    using System.Text.RegularExpressions;
    public class Example
        static void Main()
            string input = "AAAA BBB CCCC DD EEEE FFFFFFF";
            string regex = @"(.)(\1)+";
            string output = Regex.Replace(input, regex, "$1");
            //Output: A B C D E F

    Explanation of regex:


    Match the regular expression below and capture its match into backreference number 1 «(.)»

       Match any single character that is not a line break character «.»

    Match the regular expression below and capture its match into backreference number 2 «(\1)+»

       Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»

       Note: You repeated the capturing group itself.  The group will capture only the last iteration.  Put a capturing group around the repeated group to capture all iterations. «+»

       Match the same text as most recently matched by capturing group number 1 «\1»


    Created with RegexBuddy

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