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pcre_copy_substring man page
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int pcre_copy_substring(const char *subject, int *ovector, int stringcount, int stringnumber, char *buffer, int buffersize);
This is a convenience function for extracting a captured substring into a given buffer. The arguments are:
subject Subject that has been successfully matched ovector Offset vector that pcre_exec() used stringcount Value returned by pcre_exec() stringnumber Number of the required substring buffer Buffer to receive the string buffersize Size of buffer
The yield is the legnth of the string, PCRE_ERROR_NOMEMORY if the buffer was too small, or PCRE_ERROR_NOSUBSTRING if the string number is invalid.