I need a PS function that would take input string and generate output collection as per below:
Input:
$someString = "abcd{efg|hijk|lmn|o}pqrs"
Desired output:
$someCollection = #("abcdefgpqrs","abcdhijkpqrs","abcdlmnpqrs","abcdopqrs")
Note: there is going to be at most 1 {...|...|...} expression within the input string; the number of pipes is dynamic and can be anything from 1 to 20 ish.
As I drive the input data, the format of the string to explode does not have to follow exactly the example above; it can be anything else; I am looking for simplicity rather than sophistication.
My question is, is there any RegExp based solution that I could use straight away or should I write my function from the scratch, analysing intput string, detecting all the {s, |s and }s and so on?
Platform: Windows 7 / Windows Server 2012, PowerShell 5.x
You could do this using PowerShell 5 using regex pretty easily:
# define a regex pattern with named groups for all three parts of your string
$pattern = '^(?<pre>[^\{]*)\{(?<exp>.*)\}(?<post>[^\}]*)$'
if($someString -match $pattern){
# grab the first and last parts
$prefix = $Matches['pre']
$postfix = $Matches['post']
# explode the middle part
foreach($part in $Matches['exp'] -split '\|'){
# create a new string for each of the exploded middle parts
"$prefix$part$postfix"
}
}
Related
I have a regular expression that I use several times in a script, where a single word gets changed but the rest of the expression remains the same. Normally I handle this by just creating a regular expression string with a format like the following example:
# Simple regex looking for exact string match
$regexTemplate = '^{0}$'
# Later on...
$someString = 'hello'
$someString -match ( $regexTemplate -f 'hello' ) # ==> True
However, I've written a more complex expression where I need to insert a variable into the expression template and... well regex syntax and string formatting syntax begin to clash:
$regexTemplate = '(?<=^\w{2}-){0}(?=-\d$)'
$awsRegion = 'us-east-1'
$subRegion = 'east'
$awsRegion -match ( $regexTemplate -f $subRegion ) # ==> Error
Which results in the following error:
InvalidOperation: Error formatting a string: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.
I know what the issue is, it's seeing one of my expression quantifiers as a replacement token. Rather than opt for a string-interpolation approach or replace {0} myself, is there a way I can tell PowerShell/.NET to only replace the 0-indexed token? Or is there another way to achieve the desired output using format strings?
If a string template includes { and/or } characters, you need to double these so they do not interfere with the numbered placeholders.
Try
$regexTemplate = '(?<=^\w{{2}}-){0}(?=-\d$)'
I am fairly new to Puppet and Ruby. Most likely this question has been asked before but I am not able to find any relevant information.
In my puppet code I will have a string variable retrieved from the fact hostname.
$n="$facts['hostname'].ex-ample.com"
I am expecting to get the values like these
DEV-123456-02B.ex-ample.com,
SCC-123456-02A.ex-ample.com,
DEV-123456-03B.ex-ample.com,
SCC-999999-04A.ex-ample.com
I want to perform the following action. Change the string to lowercase and then replace the
-02, -03 or -04 to -01.
So my output would be like
dev-123456-01b.ex-ample.com,
scc-123456-01a.ex-ample.com,
dev-123456-01b.ex-ample.com,
scc-999999-01a.ex-ample.com
I figured I would need to use .downcase on $n to make everything lowercase. But I am not sure how to replace the digits. I was thinking of .gsub or split but not sure how. I would prefer to make this happen in a oneline code.
If you really want a one-liner, you could run this against each string:
str
.downcase
.split('-')
.map
.with_index { |substr, i| i == 2 ? substr.gsub(/0[0-9]/, '01') : substr }
.join('-')
Without knowing what format your input list is taking, I'm not sure how to advise on how to iterate through it, but maybe you have that covered already. Hope it helps.
Note that Puppet and Ruby are entirely different languages and the other answers are for Ruby and won't work in Puppet.
What you need is:
$h = downcase(regsubst($facts['hostname'], '..(.)$', '01\1'))
$n = "${h}.ex-ample.com"
notice($n)
Note:
The downcase and regsubst functions come from stdlib.
I do a regex search and replace using the regsubst function and replace ..(.)$ - 2 characters followed by another one that I capture at the end of the string and replace that with 01 and the captured string.
All of that is then downcased.
If the -01--04 part is always on the same string index you could use that to replace the content.
original = 'DEV-123456-02B.ex-ample.com'
# 11 -^
string = original.downcase # creates a new downcased string
string[11, 2] = '01' # replace from index 11, 2 characters
string #=> "dev-123456-01b.ex-ample.com"
I have a string in excel that I need to extract a substring from
This is an example of the string:
<\Text Name="Text5"><TextValue>Hostname: hostnamehere</TextValue>
I'm new to regex and powershell, but I'm trying to find a way to extract the "hostname here" portion of the string. It's variable length, so indexing won't be reliable.
since you changed the sample, the comment code i posted won't work. [grin] this will, tho ...
$InStuff = '<\Text Name="Text5"><TextValue>Hostname: hostnamehere</TextValue>'
$InStuff.Split(':')[-1].Split('<')[0].Trim()
output = hostnamehere
if you have a set of sample strings, then you likely otta post them so the code can be arranged to handle the needed variants.
If that were xml, it would be straightforward
[xml]$xml = '<Text Name="Text5"><TextValue>Hostname: hostnamehere</TextValue></Text>'
(-split $xml.text.textvalue)[1]
hostnamehere
I got data like this:
3LLO24MACT01 24MOB_6012010051700000020100510105010 123456
It contains different values for different columns when I import it.
Every column is fixed width:
Col#1 is the ID and just 1 long. Meaning it is "3" here.
Col#2 is 3 in length and here "LLO".
Col#3 is 9 in length and "24MACT01 " (notice that the missing ones gets filled up by blanks).
This goes on for 15 columns or so...
Is there a method to quickly cut it into different elements based on sequence length? I couldn't find any.
This can be done with RegEx matching, and creating an array of custom objects. Something like this:
$AllRecords = Get-Content C:\Path\To\File.txt | Where{$_ -match "^(.)(.{3})(.{9})"} | ForEach{
[PSCustomObject]#{
'Col1' = $Matches[1]
'Col2' = $Matches[2]
'Col3' = $Matches[3]
}
}
That will take each line, match by how many characters are specified, and then create an object based off those matches. It collects all objects in an array and could be exported to CSV or whatever. The 'Col1', 'Col2' etc are just generic column headers I suggested due to a lack of better information, and could be anything you wanted.
Edit: Thank you iCodez for showing me, perhaps inadvertantly, that you can specify a language for your code samples!
[Regex]::Matches will do this rather easily. All you need to do is specify a Regex pattern that has . followed by the number of characters you want in curly braces. For example, to match a column of three characters, you would write .{3}. You then do this for all 15 columns.
To demonstrate, I will use a string that contains the first three columns of your example data (since I know their sizes):
PS > $data = '3LLO24MACT01 '
PS > $pattern = '(.{1})(.{3})(.{9})'
PS > ([Regex]::Matches($data, $pattern).Groups).Value
3LLO24MACT01
3
LLO
24MACT01
PS >
Note that the first value outputted will be the text matched be all of the capture groups. If you do not need this, you can remove it with slicing:
$columns = ([Regex]::Matches($data, $pattern).Groups).Value
$columns = $columns[1..$columns.Length]
New-PSObjectFromMatches is a helper function for creating PS Objects from regex matches.
The -Debug option can help with the process of writing the regex.
I've found myriad methods to retrieve data FROM a string with substrings, but what I want to do is create a new string that contains substrings. The reason for this is that I want to pass that string to a CSV through the Export-CSV cmdlet. This is in a PowerShell Forms created app.
So the plan would be to
1). Read the contents of each text box:
(e.g. $endusername.text $endusernumber.text $locationname.text)
2). Store those into a new string with substrings
($formoutput.endusername $formoutput.endusernumber $formoutput.locationname)
3). Output the string to a .CSV
Export-CSV -InputObject $formoutput "c:\output\formoutput.csv"
Basically, if I take any existing cmdlet (say, Get-Mailbox), store its output as a string, and then pass that string through the Export-CSV in the way explained above, it performs exactly the way I like - creating a .CSV with each of the substrings as a column, and the contents of that substring in the appropriately headed column. I just want to be able to do that with a string containing substrings that I define.
I think you are confusing nomenclature a little bit. It sounds like what you want is a custom object not a string. Here is some pseudo-code to get you going in the right direction:
$formOutput = New-Object PsCustomObject -Property #{'EndUserName' = $endUserName.Text;
'EndUserNumber' = $endUserNumber.Text;
'LocationName' = $locatioName.Text}
$formOutput | Export-CSV .\FileName.csv -NoTypeHeader