Regex # Special Character Escape

[#1]

I'm trying to use regex to match the line:
# DOG CAT BIRD

NiFi regex seems to treat # as a comment character, whereas other regexes do not.

How do I match the literal character # in a string with regex?

The doc page https://nifi.apache.org/docs/nifi-docs/html/expression-language-guide.html#escaping doesn't seem to help me out here.

[#2]

Did you try using '\' character?

[#3]

With the '\' character, the '#' character still highlights the text after it as a comment:

[#4]

Thanks Matt, I didn't realize that the colored text was not a comment in this case.