pcre2_config man page

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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_HEAPLIMIT       Default heap memory limit                                
  PCRE2_CONFIG_DEPTHLIMIT      Default backtracking depth 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_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.

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