CODEWITHSUNDEEP
c#.netregexstring
C Sharper
C Sharper

Reputation: 8646

How to replace first occurrence of whitespace with comma?

I have string as :

string sku= "plmca60     5";

I just wanted to replace first blank space with comma. Hence I tried:

sku.replace(" ",",");

But it given me:

sku="plmca60,,,,,5";

Its because five blank spaces are there in the string. But I want to replace just first occurrence of blank space like;

sku="plmca60,    5"

How can I do like this?

Upvotes: 0

Views: 4101

Answers (8)

asontu
asontu

Reputation: 4659

I would capture 1 space with 0 or more spaces after that in a capture group. That way you can replace it with a comma and the content of the capture-group (which was any spaces after the first one)

Regex.Replace(input, @"\s(\s*)", ",$1");

Online demo

Upvotes: 1

Vineeth Chitteti
Vineeth Chitteti

Reputation: 1574

Two line version:

string sku = "plmca60     5";
Console.WriteLine(sku.Insert(sku.IndexOf(" ")).Remove(sku.Index(" "));

Upvotes: 0

Amit
Amit

Reputation: 890

            string sku = "plmca60     5";
            int pos = sku.IndexOf(" ");
            char[] a = sku.ToCharArray();
            a[pos]=a[pos].ToString().Replace(" ", ",").ToCharArray()[0];
            var result = new string(a);

This is dirty way. Meanwhile trying to find out shorter way of doing this.

Upvotes: 1

Soner Gönül
Soner Gönül

Reputation: 98868

First of all, String.Replace method1 returns your string as plmca60,,,,,5 because from documentation;

Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string.

You don't need regex for that.

You can use String.IndexOf(string) to get first index of a white space and a little bit Remove and Insert methods combination.

Reports the zero-based index of the first occurrence of the specified string in this instance

string sku = "plmca60     5";
int index = sku.IndexOf(" ");
sku = sku.Remove(index, 1).Insert(index, ",");
Console.WriteLine(sku);

Result will be;

plmca60,    5

Here a demonstration.

1: Remember, it is Replace, not replace. C# is case sensitive language.

Upvotes: 5

4b0
4b0

Reputation: 22321

By using Regex.Replace

var regex = new Regex(Regex.Escape(" "));
var newText = regex.Replace("plmca60     5", ",", 1);

Upvotes: 2

Avinash Raj
Avinash Raj

Reputation: 174874

You could use capturing groups like below,

@"^(\S*)\s"

OR

@"^(\S*) "

Replace the matched space by,

$1,

DEMO

\S matches a non-whitespace character. \S* matches zero or more non-whitespace characters. ^ asserts that we are at the start.

Code:

string sku= "plmca60 5";
string result = Regex.Replace(sku, @"^(\S*) ", "$1,");
Console.WriteLine(result);
Console.ReadLine();

IDEONE

Upvotes: 3

ne1410s
ne1410s

Reputation: 7102

You can replace all whitespace with ", ". For example:

sku = Regex.Replace(sku, @"\s+", ", ");

Upvotes: 1

Md Ashaduzzaman
Md Ashaduzzaman

Reputation: 4038

Not an optimized solution but it works,

string sku = "plmca60     5";
string[] skyArr = sku.Split(' ');
skyArr[1] = ",";
string resultString = "";
foreach (string str in skyArr) 
{
     if (str == "")
         resultString += " ";
     else
         resultString += str;
     }
}
Console.WriteLine(resultString);

Upvotes: 1

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