inputKeywords = System.Text.RegularExpressions.Regex.Split(inputString,"[^A-Za-z0-9]").Where(Function(s) not String.IsNullOrEmpty(s)).ToArray()
targetKeywords = System.Text.RegularExpressions.Regex.Split(targetString,"[^A-Za-z0-9]").Where(Function(s) not String.IsNullOrEmpty(s)).ToArray()