 the two matching algorithms
  pcre2partial       details of the partial matching facility
  pcre2pattern       syntax and semantics of supported regular expression patterns
  pcre2perform       discussion of performance issues
  pcre2posix         the POSIX-compatible C API for the 8-bit library
  pcre2sample        discussion of the pcre2demo program
  pcre2serialize     details of pattern serialization
  pcre2syntax        quick syntax reference
  pcre2test          description of the <b>pcre2test</b> co