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C# method to validate a Telegram username using RegEx
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using System; | |
using System.Text.RegularExpressions; | |
// NOTE: Change min length to 4 (instead of 5) in the RegEx if you want to include/allow NFT/Fragment usernames | |
bool ValidateTelegramUsername(string username) | |
=> Regex.IsMatch(username.TrimStart('@'), | |
@"^(?=.{5,32}$)(?!.*__)(?!^(telegram|admin|support))[a-z][a-z0-9_]*[a-z0-9]$", | |
RegexOptions.IgnoreCase | RegexOptions.Compiled); | |
Console.WriteLine(ValidateTelegramUsername("Laiteux1")); // True | |
Console.WriteLine(ValidateTelegramUsername("1Laiteux")); // False: Must start with a letter | |
Console.WriteLine(ValidateTelegramUsername("Lait")); // False: Too short (must contain between 5 and 32 characters) | |
Console.WriteLine(ValidateTelegramUsername("_Laiteux_")); // False: Starts or ends with an underscore | |
Console.WriteLine(ValidateTelegramUsername("Lait__eux")); // False: Contains two or more consecutive underscores | |
Console.WriteLine(ValidateTelegramUsername("AdminLaiteux")); // False: Starts with "Telegram", "Admin" or "Support" |
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