Pcre info

Устаревшая функция извлечения информации о шаблоне
The pcre_info  function is now obsolete because its interface is too restrictive to return all the available data about a compiled pattern. New  programs   should  use  pcre_fullinfo  instead. The yield  of pcre_info is the number of capturing subpatterns, or one of the  fol- lowing negative numbers: PCRE_ERROR_NULL      the argument code was NULL PCRE_ERROR_BADMAGIC  the "magic number" was not found If the  optptr  argument is not NULL, a copy of the options with which the pattern was compiled is placed in the integer it  points  to  (see PCRE_INFO_OPTIONS above).

If the  pattern  is  not anchored and the firstcharptr argument is not NULL, it is used to pass back information about the first character of any matched string (see PCRE_INFO_FIRSTBYTE above).