PoshBytes: Mastering Here-Strings in PowerShell

Learn PowerShell here-strings the fast way with practical examples. We cover expandable vs literal, JSON without escaping, regex patterns, file generation, inline scripts, and how to stop your text from fighting back.

This post is a companion for the video embedded below. Scroll down to see the code from the video.

Expandable vs. Literal Here-Strings

Setup

$who = 'The Doctor'
$today = Get-Date -Format 'yyyy-MM-dd'

Expandable: variables & subexpressions expand

$note = @"
Hello $who,
Today is $today.
File path: C:\Users\$who\Documents
Random number: $(Get-Random -Min 100 -Max 999)
"@
$note

Literal: NOTHING expands — great for regex and Windows paths

$literal = @'
Hello $who,
Today is $today.
Path: C:\Users\$who\Documents
Random number: $(Get-Random -Min 100 -Max 999)
'@
$literal

Regex, Paths, and Other Escape Gremlins

Work great for regex

$ssnPattern = @'
^\d{3}-\d{2}-\d{4}$
'@
"123-45-6789" -match $ssnPattern
"abc-def-ghij" -match $ssnPattern

Create config file

$config = @'
Root=C:\Program Files\Contoso\App
Data=C:\Data\Contoso
'@
$config

Generate Files (Configs, INI, Scripts) on the Fly

Auto-generated by PoshBytes

@"
Owner=$who
Date=$today
[Service]
Enabled=true
Port=8080
"@ | Set-Content -Path .\app.config

View the INI

Get-Content .\app.config

Multiline Script Blocks for Other Commands

Send script as here-string to PowerShell

$inline = @'
'From a here-string at ' + (Get-Date)
Get-Process | Select-Object -First 3 | Format-Table -AutoSize
'@
pwsh -NoProfile -Command $inline

Embed Quotes Freely (Because You Can)

Here-strings don’t care about quotes

$quoteParty = @"
He said, "PowerShell is great."
She replied, 'It gets even better with here-strings.'
And everyone clapped.
"@
$quoteParty

Pro Tip: The Finicky Terminator

Correct

$message = @"
Line 1
Line 2
"@

Incorrect — anything before the terminator will cause sadness

$message = @"
Line 1
Line 2
   "@

Wrap Up

• @” ” expands variables; @’ ‘ is literal
• Perfect for JSON, XML, INI, SQL, and regex patterns
• Embed quotes without escaping
• Terminator must be on its own line, unindented
• Works great with pwsh -Command for inline scripts