using Regular exprestion to validate IP Address in Powershell?

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I have this code in PowerShell and it does not work! any help?

I just need it to make sure that the string is a working IP not 999.999.999.999 or a normal string

just an IP [0....255].[0....255].[0....255].[0....255]

if ($newIP -match "(\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b)") { $x = $True}


How about:

[bool]($newIP -as [ipaddress])

using Regular exprestion to validate IP Address in Powershell , They used a regex validate pattern as an example of checking that a string of text if you use this with [regex]::Matches() in an attempt to extract IP addresses? The final result here is a PowerShell/.NET regex that matches only 000-255, four times, separated by periods. The first version I put up could successfully be used for validation, but not extraction. The new version can be used both for validation and extraction of IPv4 addresses from text. Now there's also a version for validating IPv6

Here is a more compact one:


PowerShell regex to accurately match IPv4 address (0-255 only , You can use regular expressions and the –match operator to validate user input. Here's a loop that keeps asking until the user enters a valid IP address: Whether it is validating an e-mail address on a tool that I wrote to create user accounts or searching a text document for e-mail addresses, a good regular expression to work with e-mail addresses is always in my toolkit. As with validating an IP address, this can either be simple or complex depending on your requirements.

or even shorter


Validate IP Addresses - Power Tips - Power Tips, From validating IP addresses to phone numbers, these are some of the handiest expressions in Boe's PowerShell toolbox. What are yours? This regular expression is too simple - if you want to it to be accurate, you need to check that the numbers are between 0 and 255, with the regex above accepting 444 in any position. You want to check for 250-255 with 25[0-5], or any other 200 value 2[0-4][0-9], or any 100 value or less with [01]?[0-9][0-9].

This works fine and errors if not full IP

$Name = "1.1" ; [bool]($Name -as [ipaddress] -and ($Name.ToCharArray() | ?{$_ -eq "."}).count -eq 3) 

Regular Expressions I Use with PowerShell -- Microsoft Certified , Matching an IP Address. Pretty cool, right? By the way, if you want to see a more complex RegEx pattern that would be used to validate an  PowerShell can save intermediate patterns (or parts of a regex) in variables that can later be uses in a more complex string, using standard variable expansion. Using regex ‘Extended Mode’ allows a regex pattern to be split across lines (and to use white space and comments) and is indicated by using ‘(?x)’ at the beginning of the regex pattern.

The following will not work ^(?:[0-9]{1,3}.){3}[0-9]{1,3}$ Take for example the part that needs to match the last octet from the IP Address [0-9]{1,3} - This will not match only number in the interval 0 to 255 Your best approach will be to dived checking of a single octet to 250 to 255; 240 to 249; 100 to 199; 10 to 99; and 0 to 99.

Using Regular Expressions with PowerShell To Locate Data , Â I'm creating a PowerShell script that will eventually use They have a regex that will go as far as matching valid ip's, whereas the example  The regex language is a powerful shorthand for describing patterns. Powershell makes use of regular expressions in several ways. Sometimes it is easy to forget that these commands are using regex becuase it is so tightly integrated. You may already be using some of these commands and not even realize it.

Topic: Detecting if IP Address Entered, Find a way below using [System.Net.IPAddress] class but without his TryParse*1 or Parse*2 methods neither Regex*1 in the parameter validation  There is more than one way to check if a given string is a valid IPv6 address and regular expression matching is only one solution. Use an existing library if you can. The library will have fewer bugs and its use will result in less code for you to maintain. The regular expression suggested by Factor Mystic is long and complex. It most likely works, but you should also consider how you'd cope if it unexpectedly fails.

Script PowerShell Tip : Validate IP Address, A quick way I found for validating that an IP Address was passed is using the [​IPAddress] Type Accelerator and the parameter option of  A regular expression is a pattern used to match text. It can be made up of literal characters, operators, and other constructs. This article demonstrates regular expression syntax in PowerShell. PowerShell has several operators and cmdlets that use regular expressions. You can read more about their syntax and usage at the links below.

PowerShell Tip: Validating IP Address as a Parameter, I've seen some posts suggesting this as a useful IPv4 Regex: \d{1,3}\.\d{1,3}\.\d{1,​3}\.\d{1,3} This matches four groups of between 1-3 digits, with each group separated by a dot. but they also match strings that aren't valid IPv4 addresses. PowerShell can save intermediate patterns (or parts of a regex) in  How to validate efficiently but shortly an IP address (v4 or v6 format) passed as parameter to a PowerShell function ? Find a way below using [System.Net.IPAddress] class but without his TryParse*1 or Parse*2 methods neither Regex*1 in the parameter validation attribute ValidateS

  • you can find a ton of matches for IP address by googling or directly here at stackoverflow. See here for the formal matching (called also complex beast :)
  • This helped me! Thanks!
  • This doesn't work all the time. If you put in "10.10" for example, it will say it's a valid IPAddress because the it will convert it to "". See… for more info
  • I wanted to add that I have been using this IPRegex and have tested it against hundreds of IP addresses. It works like a charm.
  • What? That's basically saying it accepts any combination of 1 to 3 digits and has a period between them...
  • Welcome to StackOverflow Colin. However, if this is an answer to the question (I am not sure) then it requires a little rephrasing of the explanation for clarity and readability and maybe a little formatting of the shown code.
  • Please take the tour at your convenience.
  • There is no word in main question that ^(?:[0-9]{1,3}.){3}[0-9]{1,3}$ should work. Instead of writing what will not work please try to write what will with some proper examples.