Suppose I have string like this ".1.12.3.4.12.4."
As a result I would like to get ".01.12.03.04.12.04."
As you can see, I want all numbers of length == 1 to become of length == 2 with zero at the beginning. How can I achieve this?
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4 Answers
Try this:
var input = ".1.12.3.4.12.4.";
var output = Regex.Replace(input, @"\.(\d)(?=\.)", ".0$1");
Console.WriteLine(output); // .01.12.03.04.12.04.
3 Comments
Anirudha
this won't match
1.2.4 i.e 1 at the beginning
p.s.w.g
@Anirudh OP didn't say that it needed to.
Giorgi Nakeuri
thax dude. this is the winner. but all approaches mentioned above also work great. but yours is the shortest :)
Split the string into tokens, format each resulting number and then join them back:
var input = ".1.12.3.4.12.4.";
var output = string.Join(
".",
input.Split('.')
.Select(i => i.Length == 0 ? "" : i.PadLeft(2, '0'))
);
The best part of this solution is that you can easily change the length of the padded result.
Comments
You can do this
Regex.Replace(input,@"(?<=^|[.])(?=\d([.]|$))","0");
Comments
string result = string.Join(".", str.Split(".").Select(n => n.Length == 1 ? "0" + n : n));
