Regex matches on non-VA causing `ErrorLateralityNotFound`

[dcronkite]

This can be replicated with the following test:

def test_scalp_does_not_error
	a = VAExtractor.new
	a.extract('SCALP ')  # the 'LP ' will be captured
end

The regular expression incorrectly identifies some text as a potential VA score. If no VA score is found, these will raise an ErrorLateralityNotFound. (E.g., "LP " is captured.)

vaextractor/lib/vaextractor.rb

Line 211 in d7c7261

raise ErrorLateralityNotFound

NB: Under the current code, other errors may occur before since boundary conditions aren't checked, but this is the underlying issue. (E.g.,

vaextractor/lib/vaextractor.rb

Line 179 in d7c7261

lat = searchpriorlines(lines[i-3..i-1].reverse)

)