C# : String utility code snippets

Below are the common utilities / code snippets often required while working with strings. I have written them as static functions.  [C# 3.0]

StripHtml

C# function to strip Html tags / markups from input string. Rather, it not only strips Html tags but any sort of markups written in <xxx> format. Reference to System.Text.RegularExpressions namespace needed.

   1: /// <summary>

   2: /// Removes HTML tags / markups from original string and returns it

   3: /// </summary>

   4: /// <param name="original"></param>

   5: /// <returns></returns>

   6: public static string StripHtml(string original)

   7:  {

   8:     return Regex.Replace(original, @"<(.|\n)*?>", string.Empty);

   9:  }

Removes extra spaces

Below code removes all extra spaces (wherever there is more then one space)

   1: public static string RemoveExtraSpaces(string original)

   2: {

   3:    while (original.IndexOf("  ") > 0)

   4:    {

   5:         original = original.Replace("  ", " ");

   6:    }

   7:    return original;

   8: }

Valid Email ID & URL check

Below are the C# functions to check if input string is valid email id or a valid URL. Reference to System.Text.RegularExpressions namespace needed.

   1: public static bool IsValidEMailID(string email)

   2: {

   3:      return Regex.IsMatch(email, @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");

   4: }

   5:  

   6:         

   7: public static bool IsValidUrl(string url)

   8: {

   9:    return Regex.IsMatch(url, @"http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?");

  10: }

If Null Then Empty

   1: public static string IfNullThenEmpty(string inStr)

   2:        {

   3:            return inStr ?? string.Empty;

   4:        }