extract and add number from a sentence

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Hello Sir,

i am writing an application. One of the method in the application needs to

1. extract all number values from a string. and
2. Sum all the extracted values for example,

string somedata="I want 1 coke, 1 Thumbs up etc.";

Thank you everrne.

Posted 14-May-12 15:36pm

(__Aaron__)

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Mohammad A Rahman · Accepted Answer · 2012-05-14T15:56:00

VJ's solution is pretty good. Another version of the solution might be helpful to you,

C#

namespace ConsoleApplication24
{
    using System;
    using System.Linq;
    using System.Text.RegularExpressions;

    class Program
    {
        static void Main(string[] args)
        {
            string sentence = "I want 1 coke, 1 Thumbs up etc.";
            string[] numbers = Regex.Split(sentence, @"\D+");
            int parsedValue = default(int);
            int result = numbers
                .SkipWhile(item => string.IsNullOrEmpty(item))
                .Sum(item => Int32.TryParse(item, out parsedValue) ? parsedValue : parsedValue);
            Console.WriteLine("Result {0}", result);
        }
    }
}

Hope it helps :)

VJ Reddy · Accepted Answer · 2012-05-14T15:46:00

Solution 1

LINQ and Regex can be used as follows.

C#

string sentence = @"I want 1 coke, 1 Thumbs up etc.";
int sum = sentence
    .Split(new char[]{' ','\t','\n','\r'}, StringSplitOptions.RemoveEmptyEntries)
    .Where (s => Regex.IsMatch(s,@"\d+", RegexOptions.CultureInvariant))
    .Sum (s => int.Parse(s));
Console.WriteLine (sum);

If you want to handle decimal numbers then the Regex pattern and Parse are to be modified accordingly.

Alternative

As an alternative Regex.Matches method can be used to extract only the numbers and sum them up as shown below:

C#

string inputText = @"I want 1 coke, 1 Thumbs up etc. . 2. 2.0 .5 5.5 ";
var sum = Regex.Matches(inputText,@"(?:\d*\.\d+|\d+\.\d*|\d+)",
    RegexOptions.CultureInvariant).OfType<Match>().Sum (m => double.Parse(m.Value));
Console.WriteLine (sum);

//Output
//12

Posted 14-May-12 15:46pm

VJ Reddy

Updated 14-May-12 17:25pm

v5

Comments

Mohammad A Rahman 14-May-12 21:56pm

Good answer :)

VJ Reddy 15-May-12 0:01am

Thank you, Rahman :)

VJ Reddy 14-May-12 23:08pm

To the down voted (Gold) member
Can you please give the reason for down voting so that I can know the deficiency and try to improve myself and can you please post your solution which is better than this so that it will be helpful for me, OP and others who may view this post.

Thank you very much.

Mohammad A Rahman 14-May-12 23:52pm

Just ignore them mate :) There is always someone :( I think your solution is pretty good, as you had my 5 :)

VJ Reddy 15-May-12 0:01am

Thank you, Rahman :)

(__Aaron__) 15-May-12 0:30am

Thank you sir.

VJ Reddy 15-May-12 0:31am

You're welcome and thank you for accepting the solution.

preet88 15-May-12 0:42am

even i'll also give +5

VJ Reddy 15-May-12 1:47am

Thank you :)