api for byte length limited string

[phaag]

Hi,
Thank for this nice regex project. I am looking for a regex which allows to limit the search string by a length parameter because the search string may contain valid \0 bytes. Therefore matches after these \0 bytes would be requested.
Is there an easy way to add an api for length limited strings which may contain \0 bytes?
Many thanks

[tylov]

Hi,
Yes, you can do it by

cregmatch_t match[10];
match[0].str = input; 
match[0].size = input_length;
// match[0] is both in and out param:
int ret = cregex_find(&re, input, 10, match, int creg_startend);

My STC library includes a newer version of cregex with some improvements and replace-functionality. However, it depends on a few other files in the library, see documentation. With the STC updated version, it is even simpler:

const char* data = "long  input string ....";
csview match[4];
cregex re = cregex_from("....", 0);
csview input = {.str = &data[5], .size=6};
int ret = cregex_find_sv(&re, input, match);

EDIT: actually, I haven't tested this, the regex engine may be testing both for '\0' and length internally, so it may not work. Neither C or C++ supports strings with 0 bytes inside. You should replace it with some other char / utf8 codepoint.