Now you are making the assumption keys cannot overlap. The OP never mentions that. Consider the keys "Two Three" and "Three Four Five" against the string "One Two Three Four Five". Your code will fail to return "Three Four Five" - after "Two Three" has been matched, no match in "Four Five" is found.

In reply to Re^4: Matching Many Strings against a Large List of Hash Keys (case insensitively, longest key first) by JavaFan
in thread Matching Many Strings against a Large List of Hash Keys (case insensitively, longest key first) by Anonymous Monk

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