Using Oniguruma library (optionally)

[data-man]

Can be tested by $ make USE_ONIGURUMA=1. Of course Oniguruma should be installed, e.g. $ sudo apt install libonig-dev.
I only tested on Linux. ;)

[tavianator]

Thanks for this! Just some minor comments for now, but I'm excited to see it support other regex types.

[data-man]

@tavianator What else can I do in this PR?

[tavianator]

Mostly I just need to try it out myself, haven't gotten to it yet. Also, even if it's incomplete, if you have an example of how it would enable a new regex flavour that would be good to see.

[data-man]

if you have an example of how it would enable a new regex flavour

First we need to define a switches for RE dialects.
Maybe #21 is the best place for that.

[tavianator]

There's already -regextype. It would be nice to get close to full compatibility with GNU find there.

[data-man]

Ok, got it!
I assumed you would do a new release with this PR. So that users could test it. ;)

[tavianator]

I'm open to a release that just adds the library without the new regex flavours, but I'd like to see that it's at least possible to implement them with this library

[data-man]

I'd like to see that it's at least possible to implement them with this library

https://github.com/kkos/oniguruma/blob/a2ac402a3549713e6c909752937b7a54f559beb8/src/oniguruma.h#L433-L445

/* predefined syntaxes (see regsyntax.c) */
#define ONIG_SYNTAX_ASIS               (&OnigSyntaxASIS)
#define ONIG_SYNTAX_POSIX_BASIC        (&OnigSyntaxPosixBasic)
#define ONIG_SYNTAX_POSIX_EXTENDED     (&OnigSyntaxPosixExtended)
#define ONIG_SYNTAX_EMACS              (&OnigSyntaxEmacs)
#define ONIG_SYNTAX_GREP               (&OnigSyntaxGrep)
#define ONIG_SYNTAX_GNU_REGEX          (&OnigSyntaxGnuRegex)
#define ONIG_SYNTAX_JAVA               (&OnigSyntaxJava)
#define ONIG_SYNTAX_PERL               (&OnigSyntaxPerl)
#define ONIG_SYNTAX_PERL_NG            (&OnigSyntaxPerl_NG)
#define ONIG_SYNTAX_RUBY               (&OnigSyntaxRuby)
#define ONIG_SYNTAX_PYTHON             (&OnigSyntaxPython)
#define ONIG_SYNTAX_ONIGURUMA          (&OnigSyntaxOniguruma)

[data-man]

Thanks!
Now I can start working on a better Oniguruma integration! :)