PCRE2 - Perl-compatible regular expressions (revised API) .rs #include <pcre2.h>

 int pcre2_set_max_pattern_compiled_length(  " pcre2_compile_context *ccontext, PCRE2_SIZE value);" 

. .rs This function sets, in a compile context, the maximum size (in bytes) for the memory needed to hold the compiled version of a pattern that is compiled with this context. The result is always zero. If a pattern that is passed to pcre2_compile() with this context needs more memory, an error is generated. The default is the largest number that a PCRE2_SIZE variable can hold, which is effectively unlimited.

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