As far as I understand, mbstring extension internally uses library
named oniguruma, which provides regex support for mb_ereg* and few
other functions. Oniguruma reached EOL almost year ago. This RFC
proposes deprecation and subsequent removal of all regex related
functions from mbstring extension and removing dependency on
oniguruma. Instead, Yuya offers pie extension named mb_onig/mb_onig,
which is a new home for those functions. For that goal he forked
oniguruma for providing updates on security and unicode version.

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