compute the edit distance between two strings
EditDistance( s, t )
The EditDistance(s,t) command returns an integer measure of the distance between the two strings s and t.
The edit distance between two strings s and t, is defined to be the difference between the sum of their lengths and twice the length of the longest common subsequence of s and t. If strings s and t have respective lengths m and n, then the edit distance is defined to be m+n−2⁢length⁡LongestCommonSubSequence⁡s,t. It is related to the Levenshtein metric, which is sometimes also called the edit distance.
For a different notion of the distance between two strings, see StringTools[HammingDistance] and StringTools[Levenshtein].
All of the StringTools package commands treat strings as (null-terminated) sequences of 8-bit (ASCII) characters. Thus, there is no support for multibyte character encodings, such as unicode encodings.
Since it is a metric, the edit distance satisfies the triangle inequality.
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