Question

I need to write this IronPython code in C# (I couldn’t find a similar C# library to match IronPython’s re module):

for v in variables:
  replace = re.compile(v, re.IGNORECASE)...
  re.sub(v, str(self.SQLVariables[v.upper().replace("&","")]),script_content)...

In other words, what is the C# equivalent to the following expressions:

• re.compile(…)…
• re.sub(…)…

Answer 1

Your question boils down to, how do I use regular expressions in C#?

The answer is the Regex class. To perform a replacement you need Regex.Replace(). There is no need to explicitly compile the regex because that is done when you create the Regex instance.

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The following example from MSDN illustrates how to use the class:

using System;
using System.Text.RegularExpressions;

public class Example
{
   public static void Main()
   {
      string input = "This is   text with   far  too   much   " + 
                     "whitespace.";
      string pattern = "\\s+";
      string replacement = " ";
      Regex rgx = new Regex(pattern);
      string result = rgx.Replace(input, replacement);

      Console.WriteLine("Original String: {0}", input);
      Console.WriteLine("Replacement String: {0}", result);                             
   }
}
// The example displays the following output:
//       Original String: This is   text with   far  too   much   whitespace.
//       Replacement String: This is text with far too much whitespace.