URLs With PowerShell

URLs With PowerShell

Regex… Even the PowerShell Masters struggle with it from time to time. I helped a friend of mine with some URL chaos. The URL he had was a software download and the token was inside the URL. Yeah, it was weird but totally worth it. There were many different ways to handle this one. But the Matches was the best way to go. What was interesting about this interaction was I could later in another script. Unlike my other posts, this one’s format is going to be a little different. Just following along.

The URL (Example)


Here is the string example we are working with. Inside the software installer, we have the name of the software, “Company_Software_” and the token, “0w6xBqqzwvw3PWkY87Tg301LTa2zRuPo09iBxamALBfs512rSgomfRROaohiwgJx9YH7bl9k72YwJ_riGzzD3wEFfXQ7jFZyi5USZfLtje2H68w” The question is how do you extract the token from this URL? Regex’s Matches we summon you!

Matches is one of the regex’s powerhouse tools. It’s a simple method that allows us to search a string for a match of our Regex. This will allow us to pull the token from URLs with PowerShell. First, it’s best to link to useful documentation. Here is the official Microsoft documentation. Sometimes it’s helpful. Another very useful tool can be found here.

PowerShell’s Regex can be expressed in many different ways. The clearest and most concise way is to use the -match flag.

$String -match $Regex

This of course produces a true or false statement. Then if you call the $matches variable, you will see all of the matches. Another way of doing this is by using the type method.

[regex]::Matches($String, $Regex)

This method is the same as above, but sometimes it makes more sense when dealing with complex items. The types method is the closest to the “.net” framework.

The Regex

Next, let’s take a look at the Regex itself. We are wanting to pull everything between TKN_ and the next /. This was a fun one.


The first part is the token. We want our search to start at _TKN_. This clears out all of the following information automatically: https://.download.software.net/windows/64/Company_Software. A next part is a group. Notice the (). This creates a group for us to work with. Inside this group, we are searching for all the characters inside []. We are looking for Everything starting at where we are, the TKN_ to a matching /. We want all the information so we place a greedy little +. This selects our token. This regex produces two matches. One with the word _TKN_ and one without. Thus we will want to capture the second output, aka index of 1.

$String -match '_TKN_([^/]+)'

Another way to go about this is the method-type model.

$Token = [regex]::Matches($String, '_TKN_([^/]+)') | ForEach-Object { $_.Groups[1].Value }

It same concept, instead this time we are able to parse the output and grab from group one.

Replace Method

Another way to go about this is by using replace. This method is much easier to read for those without experience in regex. I always suggest making your scripts readable to yourself in 6 months. Breaking up the string using replace makes sense in this light. The first part of the string we want to pull out is everything before the _TKN_ and the TKN itself. The second part is everything after the /. Thus, we will be using two replaces for this process.

$String -replace(".*TKN_",'')

Here we are removing everything before and the TKN_ itself. The .* ensures this. Then we wrap this code up and run another replace.

$Token = ($String -replace(".*TKN_",'')) -replace('/.*','')

Now we have our token. This method is easier to follow.


In Conclusion, parsing URLs With PowerShell can be tough, but once you get a hang of it, life gets easier. Use the tools given to help understand what’s going on.

Additional Regex Posts

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Batch – Chrome and Self-built URLs

Batch – Chrome and Self-built URLs

A previous job of mine had a unique issue. Unstandardized google chromes and self-generated icons. Both of these issues caused a lot of heartaches. Today I will show you how I solved the issue of unstandardized google chromes with batch. At the time the company’s default browser was IE. The site that needed chrome was an in-house product. I was pushing towards standardization of Google chrome 64-bit enterprise. However, management did fully agree with my thinking. So a compromise was created. I created a shortcut link on the desktop that pointed to a batch file. This batch file determined which version of Chrome was installed and loaded that chrome to the special internal page. Here is the script for this icon:

The Script

if exist "C:\Program Files\Google\Chrome\Application\chrome.exe" (
	start "CMD" /D "C:\Windows\System32\" /max "C:\Program Files\Google\Chrome\Application\chrome.exe" "https://www.bolding.us"
) else (
	if exist "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" (
		start "CMD" /D "C:\Windows\System32\" /max "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" "https://www.bolding.us"
	) else (
		msg "%username%" Chrome Not Installed

It’s a simple batch script. We first ask if the 64-bit path exists. If it does, then we open chrome to a hyperlink. If it doesn’t, we ask if the x86 version exists. If it does, we open chrome to the hyperlink. If it doesn’t, we tell the user it doesn’t exist. Pretty simple? Yeah, it’s very simple. So, the desktop shortcut would point to the batch file. The batch file would execute and load up the chrome page.

Taking it another step

This process helped a lot when it came to the next issue. The next issue was each location had a custom-hosted site on that location’s Server. There were tablets that had to float between each location. This means, that the icon on the tablet must open the custom website link at center 1 and at center 101. Thankfully each center had it’s own subnet. Each server that hosted this site hosted it at 10.x.x.5. This means all I had to do is find out the Subnet and make a .5 address in the link. Believe it or not, that’s not as hard as you would think. We are taking the script from above and pretty much piping the new URL into it.

The Script

@echo off
rem All i need to do now is grab only the IP address with batch. 
rem ipconfig | find "IPv4"
for /f "usebackq tokens=2 delims=:" %%f in (`ipconfig ^| findstr /c:"IPv4 Address"`) do set "ip=%%f"

for /f "tokens=1-4 delims=. " %%a in ("%ip%") do (
set octetA=%%a
set octetB=%%b
set octetC=%%c
set octetD=%%d

if exist "C:\Program Files\Google\Chrome\Application\chrome.exe" (
	start "CMD" /D "C:\Windows\System32\" /max "C:\Program Files\Google\Chrome\Application\chrome.exe" "http://%octetA%.%octetB%.%octetC%.5/Login.aspx"
) else (
	if exist "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" (
		start "CMD" /D "C:\Windows\System32\" /max "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" "http://%octetA%.%octetB%.%octetC%.5/Login.aspx"
	) else (
		msg "%username%" Chrome Not Installed

Inside the script you see that we are breaking down the IPv4 address. So, if you are running IPv6, this isn’t going to work. We place each Octect into it’s on veraible. Then we build the site at the link level. Bamn, done with the script.

The next part is to create the icon. Which i’ll leave that to you. I hope this little brain twister is helpful for what it is worth.