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.