NAME

       PCRE2 - Perl-compatible regular expressions (revised API)

SYNOPSIS

       #include <pcre2.h>

       int pcre2_set_compile_recursion_guard(pcre2_compile_context *ccontext,
         int (*guard_function)(uint32_t, void *), void *user_data);

DESCRIPTION

       This  function  defines,  within  a  compile  context,  a function that is called whenever
       pcre2_compile() starts to compile a parenthesized part of a pattern. The first argument to
       the  function  gives the current depth of parenthesis nesting, and the second is user data
       that is supplied when the function is set up. The callout function should return  zero  if
       all  is well, or non-zero to force an error. This feature is provided so that applications
       can check the available system stack space, in order to avoid running out. The  result  of
       pcre2_set_compile_recursion_guard() is always zero.

       There  is  a  complete  description  of  the  PCRE2  native API in the pcre2api page and a
       description of the POSIX API in the pcre2posix page.