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STRTOK(source[, delimiter[, part]])

Tokenizes the source string by occurrences of any character in the delimiter string and returns the occurrence specified by the part. I.e. if part=1, returns the substring before the first occurrence, and if part=2, returns the substring between the first and second occurrence. Zero and negative indices are not allowed. Empty tokens are always skipped in favor of the next non-empty token. In any case where the only possible output is '', the output is NULL. The delimiter is optional and defaults to ' '. The part is optional and defaults to 1.