REGEX matches in tester but not C#

Question

I have a line from a file: ; STRING WBSALT1() ; STRING WBSALT1()

and code

if (!Regex.IsMatch(line, @"\s*(;)(.*)", RegexOptions.IgnoreCase))
   {
       //do
       //stuff
   }

For some reason the REGEX isn't matching that line in the file. I ran it through a tester and it catches it just fine. Does anyone know what else could be causing the problem?

it will, however, match this (in code, not in a regex tester)

if (Regex.IsMatch(line, @"\s*(string)\s*(.*\()\s*(\d*)\)\s*;?(.*)", RegexOptions.IgnoreCase))

which really doesn't make any sense to me. I have no other issues with the thousands of other lines in the file that look similar. Any ideas?

---

EDIT : Okay so I didn't place it in the question because I didn't think it necessary. Apparently it is:

My ACTUAL if statement looks like this:

if (!Regex.IsMatch(line, @"\s*;.*") || !Regex.IsMatch(line, @"\s*(origin)\s*(.*)", RegexOptions.IgnoreCase))

Now, when I take off the || statement it works properly. Why it is doing this I do not understand. Maybe someone has some insight into this?

Answer 1

Tested in my environment and works as expected.

        string line = "; STRING WBSALT1()";

        if (!Regex.IsMatch(line, @"\s*(;)(.*)", RegexOptions.IgnoreCase))
           {
               //do
               //stuff
           }

Wondering if maybe you did not intend for the "!" to be part of the condition

 if(! ...

Regards,

Answer 2

Just to add you don't need IgnoreCase set here if you're using .* and you can lose the capture groups. You may also want to add beginning ^ and ending $ line anchors.

Tested on Ideone

string line = "; STRING WBSALT1()";
if (!Regex.IsMatch(line, @"^\s*;.*$")) {
   // do something
}