demo-turkish-i-problem.ps1

# source: https://blogs.msdn.microsoft.com/powershell/2006/04/25/using-culture-culture-culture-script-scriptblock/
Function Using-Culture {
Param(
[System.Globalization.CultureInfo]$Culture,
[ScriptBlock]$ScriptBlock
)
    $OldCulture = [System.Threading.Thread]::CurrentThread.CurrentCulture
    trap {
        [System.Threading.Thread]::CurrentThread.CurrentCulture = $OldCulture
    }
    [System.Threading.Thread]::CurrentThread.CurrentCulture = $Culture
    Invoke-Command -ScriptBlock $Scriptblock
    [System.Threading.Thread]::CurrentThread.CurrentCulture = $OldCulture
}

# https://docs.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-options#comparison-using-the-invariant-culture
# 1. Test a case insensitive regular expression match in the en-US culture
Using-Culture -Culture 'en-US' -ScriptBlock {
 [regex]::IsMatch('file','FILE',[System.Text.RegularExpressions.RegexOptions]::IgnoreCase)
}
# 2. Test a case insensitive regular expression match in the tr-TR culture
Using-Culture -Culture 'tr-TR' -ScriptBlock {
 [regex]::IsMatch('file','FILE',[System.Text.RegularExpressions.RegexOptions]::IgnoreCase)
}