I am trying to replace a different pattern for each column of my input file.

Input file

this- START
this-        START

Result I want

/this/ -START-
/this/ -START-

My code

sed 's|^\([a-zA-Z]*\)-\s\([a-zA-Z]*\)$|/\1/ -\2-|' inputfile

Output

/this/ -START-
this-        START 

The first input works but the 2nd input with a huge amount of spaces does not. How can I deal with both of them using the same line of code?