Question

I would like to know if the result of RegEx.IsMatch is affected by encoding.

I am checking if a string is contained within another one by using a regular expression pattern.

I am 99.9 % sure the pattern is correct, so my question is…

The matching test with the Regex.IsMatch, is applied on “byte level” or “string level”?

UPDATE:

This one is the Output… TEΣT

This one is the Word to match… ΤΕΣΤ

and here is the pattern…

If Regex.IsMatch(Output, "(?<=^|\b|\s)" & Regex.Escape(Word) & "(?=\s|\b|$)") Then
'dooooo
end if

Answer 1

Regular expressions are culture sensetive, so it uses the current culture for example when to decide how to handle case-sensetivity.

There is an option RegexOptions.CultureInvariant that you can use to turn this off. This causes it to use a neutral culture instead. The regular expression still works on a character level though, a chracter is a 16-bit code point, it’s not a byte.