How to Split string into words in c#

Question

How can I split the following string to words

string exp=price+10*discount-30

into

string[] words={'price',discount' }

Hello, welcome to SO. Please explain in more detail what you want to achieve. It's hard to tell right now what you want to do. — Jakub Konecki, Dec 11 '12 at 13:19
Please define what you mean by "words". Are "string" and "exp" not words? Also, is `string exp...` a declaration in C# code? Then why is the right part not a valid string? Or is this your string, as in `string s = "string exp=price+10*discount-30"`? — Thorsten Dittmar, Dec 11 '12 at 13:19
How do you define a "word"? It may be possible to solve this problem if you can be clear about such a definition. — Paul Turner, Dec 11 '12 at 13:20
There are quite a few examples you may want to look at and try, for example: http://stackoverflow.com/questions/2159026/regex-how-to-get-words-from-a-string-c — dash, Dec 11 '12 at 13:22

yonigozman · Accepted Answer · 2012-12-11T14:14:13.163

2

You could match words with regex and then get the results.

example:

        // This is the input string.
        string input = "price+10*discount-30";

        var matches = Regex.Matches(input, @"([a-z]+)", RegexOptions.IgnoreCase | RegexOptions.Multiline);
        foreach (var match in matches)
        {
            Console.WriteLine(match);
        }
        Console.ReadLine();

edited Dec 11 '12 at 14:14

answered Dec 11 '12 at 14:06

yonigozman

707
8
15

2

we can do same thing like this string[] words = Regex.Split(inputstring, @"\W+"); – ramesh nune Dec 12 '12 at 05:00

score 0 · Answer 2 · edited Dec 11 '12 at 13:33

0

Hope this example helps:

string str = "price+10*discount-30";
char[] delimiters = new char[] { '+', '1', '0', '*', '-', '3'};
string[] parts = str.Split(delimiters, StringSplitOptions.RemoveEmptyEntries);
foreach (string s in parts)
    Console.WriteLine(s);

Console.ReadLine();

Output is:

price
discount

edited Dec 11 '12 at 13:33

tukaef

9,074
4
29
45

answered Dec 11 '12 at 13:25

Nikola Crnomarkovic

81
5

if the above is to work with any numbers, then after the forloop you could check for a `Double.TryParse(s)` so that numbers are not read into it. – Vini Jan 21 '16 at 06:25

score 0 · Answer 3 · answered Dec 11 '12 at 13:28

what you want is a lexer, that tokenizes words depending on type of input. Here is a little program that does this for you.

        int dummy;
        string data = "string price = 10 * discount + 12";
        string[] words = data.Split(' ');
        LinkedList<string> tokens = new LinkedList<string>();
        LinkedList<string> keywords = new LinkedList<string>();
        LinkedList<string> operators = new LinkedList<string>();
        keywords.AddLast("string");
        operators.AddLast("*");
        operators.AddLast("/");
        operators.AddLast("+");
        operators.AddLast("=");
        operators.AddLast("-");
        foreach (string s in words)
        {
            if (keywords.Contains(s)) continue;
            if (operators.Contains(s)) continue;
            if (int.TryParse(s, out dummy) == true) continue;
            tokens.AddLast(s.Trim());
        }
        string[] data_split = tokens.ToArray();

How to Split string into words in c#

3 Answers3

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