C#: Generate a Random Sequence of Numbers and Letters From a User Defined Pattern and Characters
Here is a quick little snippet of code which uses allows one to create a sequence of numbers and letters, or any character needed, in a sequence defined by the user. Here is the code
Random rn = new Random(); string charsToUse = "AzByCxDwEvFuGtHsIrJqKpLoMnNmOlPkQjRiShTgUfVeWdXcYbZa1234567890"; MatchEvaluator RandomChar = delegate (Match m) { return charsToUse[rn.Next( charsToUse.Length )].ToString(); }; Console.WriteLine( Regex.Replace( "XXXX-XXXX-XXXX-XXXX-XXXX", "X", RandomChar ) ); // Lv2U-jHsa-TUep-NqKa-jlBx Console.WriteLine( Regex.Replace( "XXXX", "X", RandomChar ) ); // 8cPD
What is happening is that in the Regex.Replace we specify a pattern by X’s. Anything which is not an X is ignored and left in the result. We specify what characters to use in the string charsToUse and in this case we have A-Za-z0-9 expressed as written out. When we run the Regex.Replace it returns the pattern we specified with the characters we needed.
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