Function RegExMatch

source/script2.cpp:12337–12360

LPTSTR RegExMatch(LPTSTR aHaystack, LPTSTR aNeedleRegEx)
// Returns NULL if no match.  Otherwise, returns the address where the pattern was found in aHaystack.
{
	pcret_extra *extra;
	pcret *re;

	// Compile the regex or get it from cache.
	if (   !(re = get_compiled_regex(aNeedleRegEx, extra, NULL, NULL))   ) // Compiling problem.
		return NULL; // Our callers just want there to be "no match" in this case.

	// Set up the offset array, which consists of int-pairs containing the start/end offset of each match.
	// For simplicity, use a fixed size because even if it's too small (unlikely for our types of callers),
	// PCRE will still operate properly (though it returns 0 to indicate the too-small condition).
	#define RXM_INT_COUNT 30  // Should be a multiple of 3.
	int offset[RXM_INT_COUNT];

	// Execute the regex.
	int captured_pattern_count = pcret_exec(re, extra, aHaystack, (int)_tcslen(aHaystack), 0, 0, offset, RXM_INT_COUNT);
	if (captured_pattern_count < 0) // PCRE_ERROR_NOMATCH or some kind of error.
		return NULL;

	// Otherwise, captured_pattern_count>=0 (it's 0 when offset[] was too small; but that's harmless in this case).
	return aHaystack + offset[0]; // Return the position of the entire-pattern match.
}