I have a list of users in a text file who's names are in the following format: xn-tsai-01.
How do I script to remove the xn- KEEP THIS -01 so the output is like: tsai
I know how to do this in bash but not too familiar with powershell.
Thanks in advance!
Why not use Substring method. If you will always trim the first three characters, you can do the following assuming the variable is a string type.
$string = xn-tsai-01
$string.Substring(3)
Here is a quick way to do it using regex:
'xn-tsai-01' -replace '.*?-(.*)-.*','$1'
Example with a list:
(Get-Content list.txt) -Replace '.*?-(.*)-.*','$1'
You can use the .NET string method IndexOf("-") to find the first, and LastIndexOf("-") to find the last occurrence of "-" within the string.
Use these indexes with Substring() to remove the unnecessary parts:
function Clean-Username {
param($Name)
$FirstDash = $Name.IndexOf("-") + 1
$LastDash = $Name.LastIndexOf("-")
return $Name.Substring( $f, $l - $f )
}
PS C:\> Clean-UserName -Name "xn-tsai-01"
tsai
Boe's example is probably going to be the most efficient.
Another way is to use the split() method if they're in a uniform format.
Get-Content .\list.txt | % { ($_.Split('-'))[1] }
% is an alias for ForEach
Related
Been scratching my head on this one...
I'd like to remove .com and capitalize S and T from: "sometext.com"
So output would be Some Text
Thank you in advance
For most of this you can use the replace() member of the String object.
The syntax is:
$string = $string.replace('what you want replaced', 'what you will replace it with')
Replace can be used to erase things by using blank quotes '' for the second argument. That's how you can get rid of .com
$string = $string.replace('.com','')
It can also be used to insert things. You can insert a space between some and text like this:
$string = $string.replace('et', 'e t')
Note that using replace does NOT change the original variable. The command below will print "that" to your screen, but the value of $string will still be "this"
$string = 'this'
$string.replace('this', 'that')
You have to set the variable to the new value with =
$string = "this"
$string = $string.replace("this", "that")
This command will change the value of $string to that.
The tricky part here comes in changing the first t to capital T without changing the last t. With strings, replace() replaces every instance of the text.
$string = "text"
$string = $string.replace('t', 'T')
This will set $string to TexT. To get around this, you can use Regex. Regex is a complex topic. Here just know that Regex objects look like strings, but their replace method works a little differently. You can add a number as a third argument to specify how many items to replace
$string = "aaaaaa"
[Regex]$reggie = 'a'
$string = $reggie.replace($string,'a',3)
This code sets $string to AAAaaa.
So here's the final code to change sometext.com to Some Text.
$string = 'sometext.com'
#Use replace() to remove text.
$string = $string.Replace('.com','')
#Use replace() to change text
$string = $string.Replace('s','S')
#Use replace() to insert text.
$string = $string.Replace('et', 'e t')
#Use a Regex object to replace the first instance of a string.
[regex]$pattern = 't'
$string = $pattern.Replace($string, 'T', 1)
What you're trying to achieve isn't well-defined, but here's a concise PowerShell Core solution:
PsCore> 'sometext.com' -replace '\.com$' -replace '^s|t(?!$)', { $_.Value.ToUpper() }
SomeText
-replace '\.com$' removes a literal trailing .com from your input string.
-replace '^s|t(?!$), { ... } matches an s char. at the start (^), and a t that is not (!) at the end ($); (?!...) is a so-called negative look-ahead assertion that looks ahead in the input string without including what it finds in the overall match.
Script block { $_.Value.ToUpper() } is called for each match, and converts the match to uppercase.
-replace (a.k.a -ireplace) is case-INsensitive by default; use -creplace for case-SENSITIVE replacements.
For more information about PowerShell's -replace operator see this answer.
Passing a script block ({ ... }) to dynamically determine the replacement string isn't supported in Windows PowerShell, so a Windows PowerShell solution requires direct use of the .NET [regex] class:
WinPs> [regex]::Replace('sometext.com' -replace '\.com$', '^s|t(?!$)', { param($m) $m.Value.ToUpper() })
SomeText
I have a string with different length. I want to cut a specific word in my string.
Please help, I am new to PowerShell.
I tried this code, it's still not what I need.
$String = "C:\Users\XX\Documents\Data.txt"
$Cut = $String.Substring(22,0)
$Cut
My expectation is that I can return the word Data.
Assuming the string is always the same format (i.e. a path ending in a filename), then there are quite a few ways to do this, such as using regular expressions. Here is a slightly less conventional method:
# Define the path
$filepath = "C:\Users\XX\Documents\Data.txt"
# Create a dummy fileinfo object
$fileInfo = [System.IO.FileInfo]$filePath
# Get the file name property
$fileInfo.BaseName
Of course, you could do all of this in one step:
([System.IO.FileInfo]"C:\Users\XX\Documents\Data.txt").BaseName
If the path is an existing one, you could use
(Get-Item $String).BaseName
Otherwise
(Split-Path $String -Leaf) -Replace '\.[^\.]*$'
While in that specific example the simplest way is to use Substring(startPosition,length) to extract file name you'd probably want to use something like this:
(("C:\Users\XX\Documents\Data.txt".split("\\"))[-1].Split("."))[0]
Explanation:
("C:\Users\XX\Documents\Data.txt".split("\\"))[-1]
that part split the path by \ and returns last item (escaping it seems to be not mandatory by the way so you can use .split("\") instead of .split("\\")). From it you receive Data.txt so you have to separate name and extension. You can do this by splitting by . and choosing first element returned
There are number of ways of doing it depending upon your input -
Method 1 - Hard-coding using the sub-string function.
$String = "C:\Users\XX\Documents\Data.txt"
$Cut = $String.Substring(22,4)
$Cut
The above approach will work for a single input but will become difficult to manage for multiple inputs of different lengths.
Method 2 - Using the split method
$String = "C:\Users\XX\Documents\Data.txt"
$cut = $String.Split("\")[-1].split(".")[0]
$cut
Split method will split string into substring. The index [-1] will return the last value returned by the split method.
The second split is to return the word Data from the word Data.txt.
Method 3 - If the input is a file path
$string = Get-ChildItem $env:USERPROFILE\Desktop -File | select -First 1
$Cut = $String.BaseName
More about method 3 here.
If you can use Powershell 6 - SplitPath
#Requires -Version 6.0
Split-Path $String -LeafBase
I want to get the index of the last "\" occurrence in order to trim the "Activity" word and keep it, from following string in PowerShell:
$string = "C:\cmb_Trops\TAX\Auto\Activity"
I'm converting the code from VBScript to PowerShell and in VB there's this solution :
Right(string, Len(string) - InStrRev(string, "\"))
Using Right and InStrRev functions which makes the life more easier. Unfortunately I didn't find anything like it in PowerShell. Can't find any option to scan from the end of the string.
$String.Split("\")[-1]
Or if $String is actually a real path, you might consider:
Split-Path $String -Leaf
$string = "C:\cmb_Trops\TAX\Auto\Activity"
$string = $string.Substring($string.lastIndexOf('\') + 1)
echo $string
Check out:
https://community.spiceworks.com/topic/1330191-powershell-remove-all-text-after-last-instance-of
For example if the string is blahblah02baboon - I need to get the "baboon" seperated from the rest and the variable would countain only the characters "baboon". Every string i need to do this with has alphabet characters first then 2 numbers then more alphabet characters, so it should be the same process everytime.
Any advice would be greatly appreciated.
My advice is to learn about regular expressions.
'blahblah02baboon' -replace '\D*\d*(\w*)', '$1'
Or use regex
$MyString = "01baaab01blah02baboon"
# Match any character which is not a digit
$Result = [regex]::matches($MyString, "\D+")
# Take the last result
$LastResult = $Result[$Result.Count-1].Value
# Output
Write-Output "My last result = $LastResult"
I am having trouble with string replacement in powershell. Please consider the following expression:
"replaceTarget: %rep" -replace '%rep','$_'
I expect the result of this expression to be:
replaceTarget: $_
but instead, it is
replaceTarget: replaceTarget: $rep
I assume it is because the replacement string '$_' has some other meaning in the replace function.
How can I escape the input string so that $_ can be passed in without being evaluated?
try with this:
'replaceTarget: %rep' -replace '%rep','$$_'
you coud use the .net replace function like this :
'replaceTarget: $rep'.replace("`$rep",'$_')