PowerShell multiline match with regex

Question

Folks.

I'm trying to get a signature from the script. But each multiline match in PowerShell, which I'm doing not catching it.

The idea to catch lines of ===== and everything between them.

$Content = @'
Function Show-Example
{
    #Some text
    Another text
    Even more text with : like that.

    ==============================
    Org: Home Garage Inc.
    Author: Mr.Smit
    Created: 12/12/2021
    Last update: 12/12/2021
    Version: 1.1.1
    ==============================

    Other text
    And More text { Some blocks of code }
    Even more not interesting text :-)

}
'@

$FilePath = "$env:USERPROFILE\Desktop"

Set-Content -Value $Content -Path "$FilePath\Example_File.ps1"

$Content = Get-Content -Path "$FilePath\Example_File.ps1"

$Signature = $Content | Select-String -Pattern '(?smi)(====.+====(\n.+){1,}){1,}'

$Signature

What I'm doing wrong?

Get-Content -Path "$FilePath\Example_File.ps1" -Raw. And then the regex should be (?ms)^\s*===+\s*(.*?)\r?\n\s*==== — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Jul 9, 2021 at 8:47

Daniel · Accepted Answer · 2021-07-09 17:14:28Z

2

$Content = @'
Function Show-Example
{
    #Some text
    Another text
    Even more text with : like that.

    ==============================
    Org: Home Garage Inc.
    Author: Mr.Smit
    Created: 12/12/2021
    Last update: 12/12/2021
    Version: 1.1.1
    ==============================

    Other text
    And More text { Some blocks of code }
    Even more not interesting text :-)

}
'@ -split '\r?\n'

$between = $false
switch -regex ($Content) {
    '[=]{3,}' {
        $between = !$between
    }
    Default {
        if ($between) {
            $_
        }
    }
}

OR if you want to use a file directly as the input to switch

$file = 'C:\temp\powershell\test_lines.ps1'
$between = $false
switch -regex -File $file {
    '[=]{3,}' {
        $between = !$between
    }
    Default {
        if ($between) {
            $_
        }
    }
}

edited Jul 9, 2021 at 17:14

answered Jul 9, 2021 at 9:02

Daniel

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Wiktor Stribiżew · Accepted Answer · 2021-07-09 08:59:33Z

2

First of all, you need to pass the -Raw option when you Get-Content from a file to read it into a single string variable (else, it will be processed line by line, not as a single string).

Then, you need to use

(?sm)^\s*===+\s*(.*?)\r?\n\s*====

See this regex demo. The value between ===s will be in Group 1.

Details

(?sm) - multiline and singleline modes on
^ - start of a line
\s* - zero or more whitespaces
===+ - three or more = chars
\s* - zero or more whitespaces
(.*?) - Group 1: any zero or more chars as few as possible
\r?\n - CRLF or LF line break
\s* - zero or more whitespaces
==== - four = chars.

You may get it into Group 0, too:

(?sm)(?<=^\s*===+\r?\n\s*).*?(?=\r?\n\s*====)

where the left- and right-hand parts are wrapped with lookaround syntax. See this regex demo.

edited Jul 9, 2021 at 8:59

answered Jul 9, 2021 at 8:53

Wiktor Stribiżew

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