file: job.t package: muf status: alpha
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
value (not an error).
nil success value,
end are undefined.
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