Split words by capital letter using Regex

Say we want to split the words HoleWizard, ManyToMany into such strings as “Hole Wizard”, or “Many To Many”. Using Regex is a good choice. I don’t know if the following code is the best or not, but it just works.

string BreakWordBySmallBigLetter(string inputstr)
{
Regex reg = new Regex(@”([a-z])[A-Z]”);
MatchCollection col= reg.Matches(inputstr);
int iStart = 0;
string Final = string.Empty;
foreach (Match m in col)
{
int i = m.Index;

Final +=inputstr.Substring(iStart, i-iStart+1)+ ” “;
iStart = i+1;
}
string Last = inputstr.Substring(iStart, inputstr.Length – iStart);
Final += Last;
return Final;
}

Calling Example:
string outputstr = BreakWordBySmallBigLetter(inputstr);

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