Regex Searches

Question

I'm trying to take some delphi code and convert it over to C# to test something.  So I copied all of the code and made some search and replaces.  Eventually I get to the point it looks like this.

myObj.myProperty(StrToInt(myQuery.FieldByName('MY_FIELD').Text));

Now I have about 50 lines that look like that.  Okay simple!  I'll use a regular expression, right?  So the first thing I want to do is to change it so that it looks like this:

myObj.myProperty = StrToInt(myQuery.FieldByName('MY_FIELD').Text));

(Now for those just skimming, I'm making incremental steps to go from Delphi to C#.  So yes, I know that it's not correct at that phase.)

Easy,  I'll use the expression "(\.\w+)\(" and replace it with "\1 = ".  But then I try it and the IDE says it can't find (\.\w+)\(  Huh?  So I test out (\.\w+) and it finds it.  Okay, so I fire up everyone's favorite regex site regexlib.com  I pasted my regex and my code and it works exactly the way I would expect on regexlib.  This isn't the first time I've struggled with regex searches with Visual Studio (one time it worked however I could only see \0 and not \1).  So is it just broke?  Or am I truly doing something wrong?