While searching for ways to make the Slackbot more flexible, I came across an article by Austin Pray that mentioned how to use a Perl module called 'Regexp-Genex' that would statically compile a list of strings that would match a given regular expression.
The Dockerfile in this repository is built on top of perl:5-slim, loads the
Regexp-Genex module (via cpanm), and sets and entrypoint so that one use
docker run along with any regular expressions to statically compile.
The genex program will then dump out the list of strings separated by a comma, each on their own line.
To pull the image: docker pull wesley-dean-flexion/genex
To run the image: docker run --rm -it wesley-dean-flexion/genex pattern(s)
# docker run --rm -it wesleydeanflexion/genex 'fo{1,3}'
fooo,
foo,
fo
# docker run --rm -it wesleydeanflexion/genex '(Wes|Wesley) likes (Docker|Perl)'
Wes likes Docker,
Wes likes Perl,
Wesley likes Docker,
Wesley likes Perl
It may be convenient to add an alias:
alias genex="docker run --rm -it wesleydeanflexion/genex"
Once that's set, one may run genex as if it was a command:
# genex 'Ready for (Slack|slack)(Bot|bot)!'
Ready for SlackBot!,
Ready for Slackbot!,
Ready for slackBot!,
Ready for slackbot!
Austin Pray's website: https://austinpray.com/
Austin's article: https://austinpray.com/hacks/2015/04/16/using-regex-with-slackbot-responses.html
Perl module: https://metacpan.org/pod/release/BOWMANBS/Regexp-Genex-0.07/lib/Regexp/Genex.pm