Add Remove RegEx Options in .NET

Question

I want to take regex options as input from user and I am using check boxes to take input, which looks something like following:

[ ]IngoreCase  
[ ]Multiline  
[ ]Sigleline  
[ ]RightToLeft  

etc.

My questions is that how I can pass parameters (RegexOptions) according to option(s) selected by user.

Thanks,
Amit

Answer 1

use Enum.GetNames

string[] names = Enum.GetNames(typeof(RegexOptions));

and from string back to enum

var option = (RegexOptions)Enum.Parse(typeof(RegexOptions), "IgnoreCase");

Answer 2

When you use those options, you "OR" them together into a single value. There is no need to do that in 1 statement within the regex call, you could use something like:

var options = RegexOptions.None;
if (checkBoxIgnoreCase.Checked) options = options | RegexOptions.IgnoreCase;
if (checkBoxMultiLine.Checked) options = options | RegexOptions.MultiLine;
// etc.

and use that options value in your Regex.Match .