How to separate 1 string into multiple strings [duplicate]

Question

How do I convert "ThisIsMyTestString" into "This Is My Test String" using C#?

Is there a fast way to do it?

I've been thinking of a pseudo code but it's complicated and ugly:

String s = "ThisIsMyTestString";

List<String> strList = new List<String>();
for(int i=0; i < str->Length ; i++)
{
   String tmp = "";
   if (Char.IsUpper(str[i]))
   {
     tmp += str[i];
     i++;
   }

   while (Char::IsLower(str[i]))
   {
     tmp += str[i];
     i++;
   }

   strList .Add(tmp);
}

String tmp2 = "";
for (uint i=0 ; i<strList.Count(); i++)
{
  tmp2 += strList[i] + " ";
}

Answer 1

You can use Regex as outlined here:

Regular expression, split string by capital letter but ignore TLA

Your regex: "((?<=[a-z])[A-Z]|A-Z)"

Find and replace with " $1"

string splitString = Replace("ThisIsMyTestString", "((?<=[a-z])[A-Z]|[A-Z](?=[a-z]))", " $1")

Here (?<=...) is a "positive lookbehind, a regex that should precede the match. In this case the lookbehind is "characters 'a' through 'z'" (?=...) is a similar construct with lookahead, where the match has to be followed by regex-described string. In this case the lookahead is "characters 'a' through 'z'" In both cases the final match contains one character "A" through "Z" followed by 'a'-'z' OR one character 'a' through 'z' followed by a capital letter. Replacing these matches puts a space between the capital and lowercase letters

Answer 2

Not best code, but it works

String.Join("", s.Select(c => Char.IsUpper(c) ? " " + c : c.ToString())).Trim()

Answer 3

lazyberezovsky beat me with a much simpler solution... but this creates less garbage so I won't delete it.

static void Main(string[] args)
{
    Console.WriteLine(SplitByCase("ThisIsMyString"));
    Console.ReadLine();
}

static string SplitByCase(string str, bool upper = true)
{
    return String.Join(" ", SplitIntoWords(str, c => Char.IsUpper(c)));
}

static IEnumerable<String> SplitIntoWords(string str, Func<char, bool> splitter)
{
    StringBuilder sb = new StringBuilder();

    for (int i = 0; i < str.Length; i++)
    {
        sb.Append(str[i]);
        if (i + 1 == str.Length || splitter(str[i + 1]))
        {
            yield return sb.ToString();
            sb.Clear();
        }
    }
}

Answer 4

This will do it for that string:

            String s = "ThisIsMyTestString";
            StringBuilder result = new StringBuilder();
            result.Append(s[0]);
            for (int i = 1; i < s.Length; i++)
            {
                if (char.IsUpper(s[i]) )
                    result.Append(' ');
                result.Append(s[i]);
            }
            s = result.ToString();