oniguruma : regular expression library ( Owner: K.Kosako )
https://github.com/kkos/oniguruma
Onigmo : regular expressions library forked from Oniguruma ( Owner: K.Takata )
https://github.com/k-takata/Onigmo
K.Takata's Web Page : bregonig.dll
http://k-takata.o.oo7.jp/
Perl正規表現雑技 ( Owner: OHZAKI Hiroki )
http://www.din.or.jp/~ohzaki/
Perl5
Perl Core Development
https://dev.perl.org/perl5/news/
perlreref - Perl Regular Expressions Reference
https://metacpan.org/dist/perl/view/pod/perlreref.pod