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#include <pcre.h>

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.

There is a complete description of the PCRE API in the pcreapi page.