Ls, I need to count the occurrences of predefined prefix strings in a large text string. E.g. pref is a boxed array of prefix strings e.g. pref=:'appl';'bee';'oran' which have to be looked up in e.g. txt=:'apples, beer and oranges (and not beef)'. The result should be the frequencies of all occurrences of these prefix strings: 1 2 1. I tried +/"1 >pref E.&.> <txt but this is too slow. Can somebody hint me in a good direction? Thanks in advance, Jan.
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