question Re: Regex # Special Character Escape in Support Questions

Regex # Special Character Escape

nicholas_stantz — Fri, 16 Sep 2022 14:21:48 GMT

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.

Re: Regex # Special Character Escape

Praninder — Thu, 02 May 2019 21:54:29 GMT

Did you try using '\' character?

Re: Regex # Special Character Escape

nicholas_stantz — Sat, 17 Aug 2019 22:39:01 GMT

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

Re: Regex # Special Character Escape

MattWho — Thu, 02 May 2019 22:25:06 GMT

@Nick Stantzos

You can ignore the unexpected coloring rendered by the NiFi Expression language editor window.
The java regex replace should work just using "# DOG CAT BIRD" or "\# DOG CAT BIRD".

Thank you,

Matt

Re: Regex # Special Character Escape

nicholas_stantz — Thu, 02 May 2019 23:45:04 GMT

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