csharp get first 5 characters of string

                
                        string result = str.Substring(0,5);
                    
                

get first number in string csharp

                        
                                var input = "12985bwevgjb9812";
string firstDigit = new String(input.TakeWhile(Char.IsDigit).ToArray());
                            
                        

csharp get first word of string

                        
                                var input = "Hello, World";
var output = Regex.Replace(input.Split()[0], @"[^0-9a-zA-Z\ ]+", "");
                            
                        

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