Why does this regex with no special character match a longer string?

Question

I am using this method to try find a match, in an example:

Regex.Match(\"A2-TS-OIL\", \"TS-OIL\", RegexOptions.IgnoreCase).Success;

I got a tru

Answer 1

If you only want a match if the test string starts with your regular expression, then you need to indicate as such:

Regex.Match("A2-TS-OIL", "^TS-OIL", RegexOptions.IgnoreCase).Success;

The ^ indicates that the match must start at the beginning of the string.