String::Approx lets you match and substitute strings approximately.
With this you can emulate errors: typing errorrs, speling errors,
closely related vocabularies (colour color),
genetic mutations (GAG ACT), abbreviations (McScot, MacScot).

NOTE: String::Approx suits the task of string matching,
not string comparison, and it works for strings, not for text.

Authors: Jarkko Hietaniemi