I was bitten pretty hard (my fault!) by a subtle difference in eXtended mode's handling of spaces in character classes. I was expecting (except in a much more complicated context) (?x)[ ] to match a single space as it does with pcre2, but that does not seem to be the case (and doesn't seem to be documented?).

In PCRE2, (?x) enables spurious use of whitespace everywhere except in character c

Currently, the readme links to ["Characterization of a global germplasm collection and its potential utilization for analysis of complex quantitative traits in maize"](https://www.researchgate.net/profile/XU_Shutu/publication/229032602_Characterization_of_a_global_germplasm_collection_and_its_potential_utilization_for_analysis_of_complex_quantitative_traits_in_maize/links/02bfe50f914d04c837000000.

[david@eb ~]$ nimble install regex@#head

Downloading https://github.com/nitely/nim-regex using git
       Tip: 1 messages have been suppressed, use --verbose to show them.
     Error: Could not read package info file in /tmp/nimble_6678/githubcom_nitelynimregex_#head/regex.nimble;
        ...   Reading as ini file failed with: 
        ...     Invalid section: .
        ...