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Task/String-matching/PicoLisp/string-matching.l

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+: (pre? "ab" "abcd")
+-> "abcd"
+: (pre? "xy" "abcd")
+-> NIL
+
+: (sub? "bc" "abcd")
+-> "abcd"
+: (sub? "xy" "abcd")
+-> NIL
+
+: (tail (chop "cd") (chop "abcd"))
+-> ("c" "d")
+: (tail (chop "xy") (chop "abcd"))
+-> NIL
+
+
+(de positions (Pat Str)
+   (setq Pat (chop Pat))
+   (make
+      (for ((I . L) (chop Str) L (cdr L))
+         (and (head Pat L) (link I)) ) ) )
+
+: (positions "bc" "abcdabcd")
+-> (2 6)