Strdistance()
Description
FUNCTION: strdistance(<string1>, <string2>)
Returns the Levenshtein edit distance between two strings. The edit distance is the minimum number of single-character edits (insertions, deletions, or substitutions) required to transform one string into the other.
Comparison is performed at the Unicode codepoint level.
Examples
> say strdistance(kitten, sitting)
You say, “3”
> say strdistance(hello, hello)
You say, “0”