RosettaCodeData/Task/Substring/PicoLisp/substring.l

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(let Str (chop "This is a string")
(prinl (head 4 (nth Str 6))) # From 6 of 4 length
(prinl (nth Str 6)) # From 6 up to the end
(prinl (head -1 Str)) # Minus last character
(prinl (head 8 (member "s" Str))) # From character "s" of length 8
(prinl # From "isa" of length 8
(head 8
(seek '((S) (pre? "is a" S)) Str) ) ) )