Question 86230 in ASP.NET Question posted in
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Replace special characters and spaces with empty string with REGEX – Asp.net

I am looking to take a string from an input text box and remove all special characters and spaces.

e.g.
Input: ##HH 4444 5656 3333 2AB##
Output: HH4444565633332AB

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2

Answers


  1. 0

    Let’s define what we are going to keep, not what to remove. If we keep Latin letters and digits only we can put

    string result = Regex.Replace(input, "[^A-Za-z0-9]", "");

    or (Linq alternative)

    string result = string.Concat(input
  .Where(c => c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' c >= '0' && c <= '9'));
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  2. 0

    If dealing with unicode to remove one or more characters that is not a letter nor a number:

    [^p{L}p{N}]+

    See this demo at regexstorm or a C# replace demo at tio.run

    • p{L} matches any kind of letter from any language
    • p{N} matches any kind of numeric character in any script
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