?- isub('E56.Language', 'languange', true, D).
D = 0.711348.

If Normalize is true, isub/4 applies string normalization as implemented by the original authors: Text1 and Text2 are mapped to lowercase and the characters "._ " are removed. Lowercase mapping is done with the C-library function towlower(). In general, the required normalization is domain dependent and is better left to the caller. See e.g., unaccent_atom/2.

Arguments:

Text1	- and Text2 are either an atom, string or a list of characters or character codes.
Similarity	- is a float in the range [0.0..1.0], where 1.0 means most similar