/// <summary>
/// This function tokenizes the string(content of each document one by one). It tokenize by using regular expressions
/// Also, StopWords will also be removed here
/// </summary>
/// <param name="input"></param>
/// <returns>it returns a string array whose each index contains a token.</returns>
public string[] Tokenize(string documentContents)
{
string pattern = "[ ۔،؛:)(!؟/؎{}‘’0123456789]"; //it will match space and other punctuation marks.
Regex _regex = new Regex(pattern);
string[] tokens = _regex.Split(documentContents);
List <string> processedList = new List <string>(); // this list will contain words after punctuation removal and stopword removal
for (int i = 0; i < tokens.Length; i++)
{
//Below line further checks if any character in RE is still in content, maybe a space character, which will be removed in if condition
MatchCollection mc = _regex.Matches(tokens[i]); //Represents the set of successful matches found by iteratively applying a regular
//expression pattern to the input string.
if (mc.Count <= 0 && tokens[i].Trim().Length > 0 && !StopWordsHandler.IsStopWord(tokens[i]))
{
processedList.Add(tokens[i]);
}
}
return(processedList.ToArray());
}
public Tokeniser()
{
StopWordsHandler stopWordHandler = new StopWordsHandler();
}