如何在字符串中使用空格将数字与单词，字符和任何其他标记分开

Question

I'm trying to separate numbers from words or characters and any other punctuation with whitespace in string wrote them together eg string is:

 string input = "ok, here is369 and777, and 20k0 10+1.any word.";

and desired output should be:

 ok, here is 369 and 777 , and 20 k 0 10 + 1 .any word. 

I'm not sure if I'm on right way, but now what I'm trying to do, is to find if string contains numbers and then somehow replace it all with same values but with whitespace between. If it is possible, how can I find all individual numbers (not each digit in number to be clearer), separated or not separated by words or whitespace and attach each found number to value, which can be used for all at once to replace it with same numbers but with spaces on sides. This way it returns only first occurrence of a number in string:

class Program
{
    static void Main(string[] args)
    {
        string input = "here is 369 and 777 and 15 2080 and 579"; 
        string resultString = Regex.Match(input, @"\d+").Value;

        Console.WriteLine(resultString);

        Console.ReadLine();
    }
}

output:

369

but also I'm not sure if I can get all different found number for single replacement value for each. Would be good to find out in which direction to go

Answer 1

If what we need is basically to add spaces around numbers, try this:

string tmp = Regex.Replace(input, @"(?<a>[0-9])(?<b>[^0-9\s])", @"${a} ${b}");
string res = Regex.Replace(tmp,   @"(?<a>[^0-9\s])(?<b>[0-9])", @"${a} ${b}");

---

Previous answer assumed that words, numbers and punctuation should be separated:

string input = "here is369 and777, and 20k0";
var matches = Regex.Matches(input, @"([A-Za-z]+|[0-9]+|\p{P})");
foreach (Match match in matches)
    Console.WriteLine("{0}", match.Groups[1].Value);

To construct the required result string in a short way:

string res = string.Join(" ", matches.Cast<Match>().Select(m => m.Groups[1].Value));

Answer 2

You were on the right path. Regex.Match only returns one match and you would have to use .NextMatch() to get the next value that matches your regular expression. Regex.Matches returns every possible match into a MatchCollection that you can then parse with a loop as I did in my example:

string input = "here is 369 and 777 and 15 2080 and 579";

        foreach (Match match in Regex.Matches(input, @"\d+"))
        {
            Console.WriteLine(match.Value);
        }

        Console.ReadLine();

This Outputs:

369
777
15
2080
579

Answer 3

This provides the desired output:

string input = "ok, here is369 and777, and 20k0 10+1.any word.";
var matches = Regex.Matches(input, @"([\D]+|[0-9]+)");
foreach (Match match in matches)
    Console.Write("{0} ", match.Groups[0].Value);

[\\D] will match anything non digit. Please note space after {0}.