String Module

This XQuery Module contains functions for string computations.

Conventions

All functions in this module and errors are assigned to the http://basex.org/modules/strings namespace, which is statically bound to the strings prefix.

Functions

strings:levenshtein

Signatures	strings:levenshtein($string1 as xs:string, $string2 as xs:string) as xs:double
Summary	Computes the Damerau-Levenshtein Distance for two strings and returns a double value (0.0 - 1.0). The distance is computed as follows: 1.0 - distance / max(length of strings) 1.0 is returned if the strings are equal; 0.0 is returned if the strings are too different.
Examples	strings:levenshtein("flower", "flower") returns 1 strings:levenshtein("flower", "floewr") returns 0.83 strings:levenshtein("flower", "rewolf") returns 0.16

strings:soundex

Signatures	strings:soundex($string as xs:string) as xs:string
Summary	Computes the Soundex value for the specified string. The algorithm can be used to find and index English words with similar pronouncation.
Examples	strings:soundex("Michael") returns M240 strings:soundex("OBrien") = strings:soundex("O'Brien") returns true

strings:cologne-phonetic

Signatures	strings:cologne-phonetic($string as xs:string) as xs:string
Summary	Computes the Kölner Phonetik value for the specified string. The algorithm was published by Hans Joachim Postel in 1969. Similar to Soundex, it is used to find similarly pronounced words in the German language.
Examples	strings:cologne-phonetic("Michael") returns 645 every $s in ("Mayr", "Maier", "Meier") satisfies strings:cologne-phonetic($s) = "67" returns true

Changelog

The Module was introduced with Version 8.3.