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SYNOPSIS
#include <pcre2.h>
PCRE2_SIZE pcre2_get_startchar(pcre2_match_data *match_data);
After a successful call of pcre2_match() that was passed the match block that is this function's argument, this function returns the code unit offset of the character at which the successful match started. This can be different to the value of ovector[0] if the pattern contains the \K escape sequence. Note, however, that \K has no effect for a partial match.
There is a complete description of the PCRE2 native API in the pcre2api page and a description of the POSIX API in the pcre2posix page.
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