c# - How to allow esc secuence charater in existing alphanumeric validation expression -

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I only use the following validation expression to validate the string to accept alphanumeric characters 

  (?! ^ [0-9] * $) (? ^ [[A-zA-Z] * $) ^ ([a-zA-Z0- 9] {6,50}) $   
 But it does not accept characters like  ~,!, (), [,], {,}  etc., I accept all these characters How do I add above expression?  
 Thank you,   
 
 
 You can use them for each character.  
 Example (Requires repeat for all character types):  
  string pattern = "(?" + Regex.Escape ("!") + "^ [0-9] * $) (?! ^ [A-zA-Z] * $) ^ ([one-zA-Z0-9] {6,50}) $ ";

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