Martin Puppe 6a96992fe0 Fix invalid regular expression #156861 ...

Empty parantheses are not supported in regular expressions on
Darwin/macOS. The old regular expression produces an error during
evaluation. This commit fixes that.

Nix‘s `builtins.match` works with extend POSIX regular expressions. The
specification for these regular expression states[^1] that the result
for a left paranthesis immediately followed by a right paranthesis
outside of a bracket expression is undefined.

[^1]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04_03

2022-01-26 16:23:14 +01:00

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