parses an option and returns the string after the '=' character

the main function that does all the filtering and test running

NOLINTEND(*-avoid-c-arrays)

see https://bugs.kde.org/show_bug.cgi?id=408547 apparently sometimes flock can return EAGAIN, despite that not being a documented return value

the implementation of parseOption()

@return the parent row containing @p index

* This function is based on the TemplateMatch function found in * llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_common.cpp * The code