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pcre_get_substring_list man page
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int pcre_get_substring_list(const char *subject, int *ovector, int stringcount, const char ***listptr);
This is a convenience function for extracting a list of all the captured substrings. The arguments are:
subject Subject that has been successfully matched ovector Offset vector that pcre_exec used stringcount Value returned by pcre_exec listptr Where to put a pointer to the list
The memory in which the substrings and the list are placed is obtained by calling pcre_malloc(). A pointer to a list of pointers is put in the variable whose address is in listptr. The list is terminated by a NULL pointer. The yield of the function is zero on success or PCRE_ERROR_NOMEMORY if sufficient memory could not be obtained.