NAME

       PCRE2 - Perl-compatible regular expressions (revised API)

SYNOPSIS

       #include <pcre2.h>

       int pcre2_config(uint32_t what, void *where);

DESCRIPTION

       This function makes it possible for a client program to find out which optional features are available in
       the version of the PCRE2 library it is using. The arguments are as follows:

         what     A code specifying what information is required
         where    Points to where to put the information

       If where is NULL, the function returns the amount of memory needed for the  requested  information.  When
       the information is a string, the value is in code units; for other types of data it is in bytes.

       If  where is not NULL, for PCRE2_CONFIG_JITTARGET, PCRE2_CONFIG_UNICODE_VERSION, and PCRE2_CONFIG_VERSION
       it must point to a buffer that is large enough to hold the string. For all other codes it must point to a
       uint32_t integer variable. The available codes are:

         PCRE2_CONFIG_BSR             Indicates what \R matches by default:
                                        PCRE2_BSR_UNICODE
                                        PCRE2_BSR_ANYCRLF
         PCRE2_CONFIG_COMPILED_WIDTHS Which of 8/16/32 support was compiled
         PCRE2_CONFIG_DEPTHLIMIT      Default backtracking depth limit
         PCRE2_CONFIG_HEAPLIMIT       Default heap memory limit
         PCRE2_CONFIG_JIT             Availability of just-in-time compiler
                                       support (1=yes 0=no)
         PCRE2_CONFIG_JITTARGET       Information (a string) about the target
                                        architecture for the JIT compiler
         PCRE2_CONFIG_LINKSIZE        Configured internal link size (2, 3, 4)
         PCRE2_CONFIG_MATCHLIMIT      Default internal resource limit
         PCRE2_CONFIG_NEVER_BACKSLASH_C  Whether or not \C is disabled
         PCRE2_CONFIG_NEWLINE         Code for the default newline sequence:
                                        PCRE2_NEWLINE_CR
                                        PCRE2_NEWLINE_LF
                                        PCRE2_NEWLINE_CRLF
                                        PCRE2_NEWLINE_ANY
                                        PCRE2_NEWLINE_ANYCRLF
                                        PCRE2_NEWLINE_NUL
         PCRE2_CONFIG_PARENSLIMIT     Default parentheses nesting limit
         PCRE2_CONFIG_RECURSIONLIMIT  Obsolete: use PCRE2_CONFIG_DEPTHLIMIT
         PCRE2_CONFIG_STACKRECURSE    Obsolete: always returns 0
         PCRE2_CONFIG_UNICODE         Availability of Unicode support (1=yes
                                        0=no)
         PCRE2_CONFIG_UNICODE_VERSION The Unicode version (a string)
         PCRE2_CONFIG_VERSION         The PCRE2 version (a string)

       The  function  yields  a  non-negative  value  on  success  or  the  negative value PCRE2_ERROR_BADOPTION
       otherwise. This is also the result for the PCRE2_CONFIG_JITTARGET code if JIT support is  not  available.
       When a string is requested, the function returns the number of code units used, including the terminating
       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.