Question

I have a textbox where user can input Regex string which shall be then used as Regex match pattern.

I wonder if there is a way to validate the syntax of the input?
How do I know if it is valid Regex pattern or not?

I would not like the user to be able to input anything, but just valid Regex pattern.

Thanks!

Answer 1

You can use a try and catch statement to test if their input is corrupt.

public bool isValidRegex(string input){
     bool ret;


     ret = true;

     try{
         new Regex(input);
     }
     catch (ArgumentException){
          ret = false;
     }

     return ret;
}