The present disclosure describes methods, systems, and computer program products for performing fuzzy substring search. One computer-implemented method includes determining, by operation of a hardware processor, one or more tokens of an input string received from a client application, identifying, from a database, a reference string based on the one or more tokens of the input string, determining a plurality of character index values of the reference string, each character index value indicating a position of a character in the reference string, determining one or more hop index values of the input string, each hop index value indicating a position of a separator in the input string, and calculating a similarity score of the reference string relative to the input string based on the plurality of character index values of the reference string and the one or more hop index values of the input string.