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AvoidUsingDoubleQuotesForConstantString.md

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description Avoid using double quotes if the string is constant
ms.date 07/21/2026
ms.topic reference
title AvoidUsingDoubleQuotesForConstantString

AvoidUsingDoubleQuotesForConstantString

Severity Level: Information

Default state: Disabled

Description

This rule detects static strings enclosed with double quotes ("<text>") with text that doesn't contain variables, expressions, or special characters that require escaping.

Enclose text with single quotes ('<text>') when the value of a string is constant. A constant string doesn't contain variables or expressions intended to insert values into the string, such as "$PID-$(hostname)". Using single quotes makes the intent clearer that the string is constant and allows you to use special characters such as $ without needing to escape them.

However, there are exceptions where this rule doesn't flag violations:

  • Double-quoted strings are preferred when the string contains single quotes
  • Embedded escape sequences like newline ("`n")
  • Other special characters that require escaping

Example

Noncompliant

$constantValue = "I Love PowerShell"

Compliant

$constantValue = 'I Love PowerShell'

Configure rule

Rules = @{
    PSAvoidUsingDoubleQuotesForConstantString  = @{
        Enable = $true
    }
}

Parameters

Enable

This parameter controls whether ScriptAnalyzer checks the code against this rule. It accepts a boolean value. To enable this rule, set this parameter to $true. The default value is $false.