CODEWITHSUNDEEP
c#.netregexstring
Danpe
Danpe

Reputation: 19047

C# Reverse all numbers in string?

I have a string:

"Hello 7866592 this is my 12432 string and 823 i need to flip all 123"

And i want to to be

"Hello 2956687 this is my 23421 string and 328 i need to flip all 321"

I use this regular expression to get all numbers:

Regex nums = new Regex("\d+");

Upvotes: 6

Views: 2211

Answers (2)

Yuriy Faktorovich
Yuriy Faktorovich

Reputation: 68687

var replacedString = 
    Regex.Replace(//finds all matches and replaces them
    myString, //string we're working with
    @"\d+", //the regular expression to match to do a replace
    m => new string(m.Value.Reverse().ToArray())); //a Lambda expression which
        //is cast to the MatchEvaluator delegate, so once the match is found, it  
        //is replaced with the output of this method.

Upvotes: 21

Justin
Justin

Reputation: 6549

Split the string on spaces. Then take the strings in the new string array that are digits and run this function on them:

public static string Reverse( string s )
{
   char[] charArray = s.ToCharArray();
   Array.Reverse( charArray );
   return new string( charArray );
}

Then recombine your array into a single string.

Upvotes: 1

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