C# find exact-match in string

Question

How can I search for an exact match in a string? For example, If I had a string with this text:

label
label:
labels

And I search for label, I only want

Answer 1

You can use a regular expression like this:

bool contains = Regex.IsMatch("Hello1 Hello2", @"(^|\s)Hello(\s|$)"); // yields false
bool contains = Regex.IsMatch("Hello1 Hello", @"(^|\s)Hello(\s|$)"); // yields true

The \b is a word boundary check, and used like above it will be able to match whole words only.

I think the regex version should be faster than Linq.

Reference