Replace number in string - C#

Question

I have a string(numbers only) and I want to replace a specific number with string.Empty. I am using string.Replace but the issue is it replaces the given number from all numbers. I've also tried Regex.Replace but getting same result.

For example,

Code:

string original = "301, 3301, 2301, 5301, 8301";
string modified = original.Replace("301", string.Empty);
string usingRegex = Regex.Replace(original, "301", string.Empty);

Actual Result:

", 3, 2, 5, 8"

Expected Result:

"3301, 2301, 5301, 8301"

Split on , , remove the ones you don't want (easy with LINQ), then string.Join the rest back together. — zimdanen
– zimdanen, Commented Apr 1, 2016 at 16:48
You have a string of numbers? Why not split this into an array of integers? — Kritner
– Kritner, Commented Apr 1, 2016 at 16:49
convert them all to numbers and get rid of 301 .. that should work right? — psj01
– psj01, Commented Apr 1, 2016 at 16:50

mason · Accepted Answer · 2016-04-01 17:25:14Z

1

const string original = "301, 3301, 2301, 5301, 8301, 301";
var lst = original.Split (',').Select(s => s.Trim()).Where(item => item != "301");
var replaced = string.Join(", ", lst);

This splits the string, and removes only those entries that are exactly 301, and joins back up the result. This is broadly a process of tokenization.

edited Apr 1, 2016 at 17:25

mason

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answered Apr 1, 2016 at 16:53

Orphid

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Comments

TVOHM · Accepted Answer · 2016-04-01 17:06:31Z

1

Try:

string usingRegex = Regex.Replace(original, "(^301 ,|, 301)", string.Empty);

This matches a 301 that ends with , or ends with ,.

edited Apr 1, 2016 at 17:06

answered Apr 1, 2016 at 16:56

TVOHM

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Comments

Marcos Barrera · Accepted Answer · 2016-04-01 16:59:23Z

0

Try with \b in your Regex something like this:

string original = "301, 3301, 2301, 5301, 8301";
string modified = original.Replace("301", string.Empty);
string usingRegex = Regex.Replace(original, @"\b301\b", string.Empty);

let me know if this was helpful.

answered Apr 1, 2016 at 16:59

Marcos Barrera

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Comments

bluetoothfx · Accepted Answer · 2016-04-01 17:04:30Z

0

You can try like this,

string pattern = @"\b301\b";
string input = "301, 3301, 2301, 5301, 8301";
string result = Regex.Replace(input, pattern, string.Empty, RegexOptions.None).TrimStart(',');

answered Apr 1, 2016 at 17:04

bluetoothfx

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Comments

xFight · Accepted Answer · 2016-04-01 17:04:58Z

0

Not very nice, but working and with Regex. Deletes (!) any number from the given string.

string original = "301, 3301, 2301, 5301, 8301";
string usingRegex = Regex.Replace(original, "(, 5301)*(^5301, )*", "");
Console.WriteLine(original);
Console.WriteLine(usingRegex);

answered Apr 1, 2016 at 17:04

xFight

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