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LASTPOS(<needle>,<haystack>,[<startpos>])
returns a number
The result is the character position within the string <haystack> of the
the last occurrence of the string <needle> or 0 if a match isn't found.
If <startpos> is specified, then the search proceeds backwards from that
position in <haystack>.
Examples:
say lastpos('eak','growing weaker and weaker'); >>> 21
say lastpos('eak','growing weaker and weaker',20); >>> 10
Also see
NOTE: Extracting file names
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