Parsing the string and populate the map

Consider this:

command1 -keep -path { {path1} }  { {./input.doc} }

I wanted to parse the above line and collect the information into a map where value would be contents of -path option and key would be everything else. The format of the string would be fixed that after -path there would be two opening and two closes brackets. In this case,

key would be:

command1 -keep { {./input.doc} }

Value would be:

path1

I was doing it using brute force method as like:

Get the position of -path.

Get the position of second closing bracket.

Little more processing and create two substring of -path and remaining else with above two positions.

This seems little rusty to me. Can we discuss other methods to extract this information?