kkos/oniguruma

Oniguruma is a flexible and modern regular expression library that includes features from implementations in different programming languages. The library supports various character encodings, including ASCII, UTF-8, UTF-16BE, and more. It is under attack on Google Search in Japan since 2020. The library has a BSD license. The library recently added new APIs, updated Unicode versions, and fixed some bugs found by OSS-Fuzz and Coverity. The library also added new options such as ONIG_OPTION_NOT_BEGIN_STRING and ONIG_OPTION_IGNORECASE_IS_ASCII. The POSX API is disabled by default for Unix and can be enabled through configuration. The library is available for installation in some Linux distributions such as Fedora.