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powershellstring-formattingip-address

Pad IP addresses with leading 0's - powershell

I'm looking to pad IP addresses with 0's

example
1.2.3.4 -> 001.002.003.004
50.51.52.53 -> 050.051.052.053

Tried this:

[string]$paddedIP = $IPvariable
[string]$paddedIP.PadLeft(3, '0')

Also tried split as well, but I'm new to powershell...

Solution

  • You can use a combination of .Split() and -join.

    ('1.2.3.4'.Split('.') | 
    ForEach-Object {$_.PadLeft(3,'0')}) -join '.'

    With this approach, you are working with strings the entire time. Split('.') creates an array element at every . character. .PadLeft(3,'0') ensures 3 characters with leading zeroes if necessary. -join '.' combines the array into a single string with each element separated by a ..

    You can take a similar approach with the format operator -f.

    "{0:d3}.{1:d3}.{2:d3}.{3:d3}" -f ('1.2.3.4'.Split('.') |
    Foreach-Object { [int]$_ } )

    The :dN format string enables N (number of digits) padding with leading zeroes.

    This approach creates a string array like in the first solution. Then each element is pipelined and converted to an [int]. Lastly, the formatting is applied to each element.