Approximate string matching concerns to find patterns in texts in presence of "mismatches" or "errors". Approximate string matching is fundamental to text processing, because we live in an error-prone world. It has several applications in data analysis and data retrieval such as, for instance, searching text under the presence of typing or spelling errors, character recognition system, spelling correction program, retrieving musical passages, or finding biological sequences in presence of possibly mutations or misreads. FuzzySearch library contains various functions for tasks exact and approximate string comparising and matching. All functions were optimised at fastacting and oriented to text processing in natural languages.Work with ANSI and with Unicode strings is supported. FuzzySearch library available for Delphi, VC, VB/VBA, and also can be used in any language as COM-object.