Gets the number of characters in the longest lookbehind assertion in the
pattern. This information is useful when doing multi-segment matching using
the partial matching facilities.
Return: the number of characters in the longest lookbehind assertion.
Gets the number of characters in the longest lookbehind assertion in the pattern. This information is useful when doing multi-segment matching using the partial matching facilities.
Return: the number of characters in the longest lookbehind assertion.