Question

I have a set of 40 characters that have their own code points. For example, U0678, u0679 and so on. How to retrieve words, strings and sub strings that only contain those characters from the text based on their code point, ignoring all other characters? I’m suffering with my old code

private string token(string x)
{
    Regex exclude = new Regex(@"\d|\s+|/|-|[A-Za-z]", RegexOptions.Compiled);
    return string.Join(" ",
      (from s in Regex.Split(x, "([ \\t{}():;.,!ـ؛،؟ \"\n])")
       where !exclude.IsMatch(s)
       select s).ToArray());
}

Edited. Assume i have the string “aaa bbb ccc ddd “. Then I would like to retrieve the words aaa and bbb only. then I would like to do something like

Regex regEx = new Regex(@"\u0041|\u0042");
Match match = regEx.Match(mystring);
if(match.Success)
 then do somthing

But i have 40 characters.

Answer 1

Ok, so you have a set of space delimited strings, and a set of 40 characters. You wish to find which of those strings (separated by spaces) are built up of only combinations of those 40 characters?

@ Chris, yes, exactly .

var charSet = new HashSet<char>("abcde\x015f" + Regex.Unescape("\u0066"));
//or var charSet = new HashSet<char>(new[] { 'a', 'b', 'c', 'd', 'e', 'ş', 'f'});
//or var charSet = new HashSet<char>(new[] { '\x0061', '\x0062', '\x0063', '\x0064', '\x0065', '\x015F', '\x0066'});
//or var charSet = new HashSet<char>(Regex.Unescape("\u0061\u0062\u0063\u0064\u0065\u015F\u0066"));
//or var charSet = new HashSet<char>("\x0061\x0062\x0063\x0064\x0065\x015F\x0066");

string input = "abc  defş aaa xyz";

var words =  input.Split()
                .Where(s => !String.IsNullOrWhiteSpace(s))
                .Where(s => s.All(c => charSet.Contains(c)))
                .ToList();