This isn't currently possible, but I think it would be a useful feature. I would propose adding it as a new conditional form, probably something like:

x := if foo ~= "bar" { a } else { b }

Where "bar" is a regex. We could also add slash-delimited regex literals, /…/, but I can't think of any strong advantages over just reusing string literals for this specific case, and adding regex literals if we need them later.

I need this feature, too. Thx

Implemented in #970! I'll try to cut a release soon, but for now it's available on master on GitHub.

The operator is =~ since that's what's used in Perl, Ruby, and other similar languages:

foo := if "hello" =~ 'hel+o' { "match" } else { "mismatch" }

bar:
  @echo {{foo}}

$ just bar
match

I just published 0.10.2, which includes regular expression conditionals. Prebuilt binaries should be available soon on the releases page. Sorry for the delay! I was on vacation 🙇‍♂️