import re
mystring = '''-desc none -type used -cost med -color blue
-desc none -msg This is a a message -name test
-desc "(-type old -cost high)" -color green'''

mydict = {}
for line in mystring.splitlines():
	key_value = re.findall(r'(-\w+)\s+("[^"]*"|.*?)(?=$|\s*-\w+\s)', line)
	print(key_value)