Incompatible regexes on MacOS

[mhasbini]

Getting:

while evaluating 'dropWildcardPrecision' at /nix/store/5yi7mqsj2m1h7jc760w0b17zs2dch21h-source/semver.nix:26:41, called from /nix/store/5yi7mqsj2m1h7jc760w0b17zs2dch21h-source/semver.nix:40:18:
while evaluating 'mkComparison' at /nix/store/5yi7mqsj2m1h7jc760w0b17zs2dch21h-source/semver.nix:13:34, called from /nix/store/5yi7mqsj2m1h7jc760w0b17zs2dch21h-source/semver.nix:33:5:
invalid regular expression '(.*?)([0-9]\.[0-9]\.[0-9]|[0-9]\.[0-9]|[0-9])?([.x*]*)', at /nix/store/5yi7mqsj2m1h7jc760w0b17zs2dch21h-source/semver.nix:28:23

That's the referenced line:

wildcardMatch = match "(.*?)([0-9]\\.[0-9]\\.[0-9]|[0-9]\\.[0-9]|[0-9])?([.x*]*)" constraint;

It can be reproduced on my machine:

$ nix-instantiate --eval -E 'builtins.match "(.*?)([0-9]\\.[0-9]\\.[0-9]|[0-9]\\.[0-9]|[0-9])" "1.2.3"'
error: invalid regular expression '(.*?)([0-9]\.[0-9]\.[0-9]|[0-9]\.[0-9]|[0-9])', at (string):1:1
$ uname -a
Darwin ... 17.7.0 Darwin Kernel Version 17.7.0: Thu Dec 20 21:47:19 PST 2018; root:xnu-4570.71.22~1/RELEASE_X86_64 x86_64

Probably related to NixOS/nix#1537

[mhasbini]

I was using an old version, this was resolved.