Replace IP in text file using PS [duplicate]

Question

Im trying to replace an ever-changing IP address in a text file. Here is the code I'm using.

$ConfigFile = "C:\Temp2\ConfigFile.overrides"

$content = [System.IO.File]::ReadAllText($ConfigFile).Replace("10.0.0.333","127.0.0.1")
[System.IO.File]::WriteAllText($ConfigFile, $content) 

How do I make the 10.0.0.333 into a wildcard so it would work with any IP and change it back to the loopback address.

Answer 1

If you're looking for valid IP addresses in the file, this will work:

$re='\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b'
$configFile='~/Documents/test/configFile.txt'

$configFileUpdate=(Get-Content $configFile) -replace $re,'127.0.0.1'
$configFileUpdate > $configFile

PS /~> cat ./configFile.txt

test test test test test test test 
test test test test test test test 
test test 10.10.0.123 test test test
test test test test test test test 
test test test test test test test 

PS /~> ./script.ps1           

test test test test test test test 
test test test test test test test 
test test 127.0.0.1 test test test
test test test test test test test 
test test test test test test test 

This regex will not work with ỳour example 10.0.0.333 because it is not a valid IP address, for this something like the regex in Olaf's comment will work.