Pester

4.10.2-beta1

Functions/Assertions/Match.ps1

                                function Should-Match($ActualValue, $RegularExpression, [switch] $Negate, [string] $Because) {

    <#

.SYNOPSIS

Uses a regular expression to compare two objects.

This comparison is not case sensitive.

.EXAMPLE

"I am a value" | Should -Match "I Am"

The "I Am" regular expression (RegEx) pattern matches the provided string,

so the test passes. For case sensitive matches, see MatchExactly.

.EXAMPLE

"I am a value" | Should -Match "I am a bad person" # Test will fail

RegEx pattern does not match the string, and the test fails.

.EXAMPLE

"Greg" | Should -Match ".reg" # Test will pass

This test passes, as "." in RegEx matches any character.

.EXAMPLE

"Greg" | Should -Match ([regex]::Escape(".reg"))

One way to provide literal characters to Match is the [regex]::Escape() method.

This test fails, because the pattern does not match a period symbol.

#>

    [bool] $succeeded = $ActualValue -match $RegularExpression

    if ($Negate) {

        $succeeded = -not $succeeded

    }

    $failureMessage = ''

    if (-not $succeeded) {

        if ($Negate) {

            $failureMessage = NotShouldMatchFailureMessage -ActualValue $ActualValue -RegularExpression $RegularExpression -Because $Because

        }

        else {

            $failureMessage = ShouldMatchFailureMessage -ActualValue $ActualValue -RegularExpression $RegularExpression -Because $Because

        }

    }

    return New-Object psobject -Property @{

        Succeeded      = $succeeded

        FailureMessage = $failureMessage

    }

}

function ShouldMatchFailureMessage($ActualValue, $RegularExpression, $Because) {

    return "Expected regular expression $(Format-Nicely $RegularExpression) to match $(Format-Nicely $ActualValue),$(Format-Because $Because) but it did not match."

}

function NotShouldMatchFailureMessage($ActualValue, $RegularExpression, $Because) {

    return "Expected regular expression $(Format-Nicely $RegularExpression) to not match $(Format-Nicely $ActualValue),$(Format-Because $Because) but it did match."

}

Add-AssertionOperator -Name         Match `

    -InternalName Should-Match `

    -Test         ${function:Should-Match}

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