file: job.t package: muf status: alpha
The findPreviousSubstring? function accepts a substring atop a
string and returns the location of the substring atop a success flag.
Search is from n-1 in the string, and proceeds backwards.
Searching from a too-large n is the same as searching from
end of string.
Searching from a too-small n results in a nil success
value (not an error).
On a nil success value, start and end are undefined.
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