PROBLEM TO BE SOLVED: To provide a computer-based method for character string matching of a candidate character string with a plurality of character string records stored in a database.SOLUTION: The method includes: a step a) of identifying a set of reference character strings in a database, wherein the reference character strings are identified utilizing an optimization search for a set of dissimilar character strings; a step b) of generating an n-gram representation for one of the reference character strings in the set of reference character strings; a step c) of generating an n-gram representation for the candidate character string; a step d) of determining a similarity between the n-gram representations; a step e) of repeating the steps b) and d) for the remaining reference character strings in the set of identified reference character strings; and a step f) of indexing the candidate character strings within the database based on the determined similarities between the n-gram representations of the candidate character string and the reference character strings in the identified set.