Hello Daniel, As you might know, pcre project is obselete now[1]. pcre will not fix any bugs or do release in future. projects are moved to pcre2[2]. I was wondering mboxgrep have any plans to port migrate to pcre2. Regards Abhijith [1] - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1000029 [2] - https://php.watch/versions/7.3/pcre2