Two simple extension methods: TrimPrefix and TrimSuffix

Today, writing programs frequently use two string operations: to delete the specified prefix and suffix of a string. Because there is no ready-made method available, two extension methods are written: TrimPrefix and TrimSuffix.

   1: namespace System

   2: {

   3:     public static class StringExtensions

   4:     {

   5:         public static string TrimPrefix(this string sourceString, string prefix, bool ignoreCase = false)

   6:         {

   7:             prefix = prefix ?? string.Empty;

   8:             if(!sourceString.StartsWith(prefix,ignoreCase, CultureInfo.CurrentCulture))

   9:             {

  10:                 return sourceString;

  11:             }

  12:  

  13:             return sourceString.Remove(0, prefix.Length);

  14:         }

  15:  

  16:         public static string TrimSuffix(this string sourceString, string suffix, bool ignoreCase = false)

  17:         {

  18:             suffix = suffix ?? string.Empty;

  19:             if (!sourceString.EndsWith(suffix, ignoreCase, CultureInfo.CurrentCulture))

  20:             {

  21:                 return sourceString;

  22:             }

  23:             return sourceString.Substring(0, sourceString.Length - suffix.Length);

  24:         }

  25:     }

  26: }

Program call:

   1: static void Main(string[] args)

   2: {

   3:     string sourceString = "ABC123";

   4:     Console.WriteLine(sourceString.TrimPrefix("ABC"));

   5:     Console.WriteLine(sourceString.TrimSuffix("123"));

   6: }

Output result:

   1: 123

   2: ABC