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