Question

I need validation for string to comply with next:

• no space char
• starts with one delimiter char
• ends with one delimiter char
• has no other char as delimiter char

How this can be done?

Updated sorry missed that should only be one delimiter char at start and at the end

Answer 1

If I understood your question right, this should do:

char delimiter = ...  
string delimiterString = delimiter.ToString();
string s = ...
bool right = !s.Contains(' ') 
  && s.StartsWith(delimiterString) 
  && s.EndsWith(delimiterString)
  && !s.Substring(1,s.Length-2).Contains(delimiter);