Private/ConvertFrom-WildcardPattern.ps1
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using namespace System.Text using namespace System.Management.Automation function ConvertFrom-WildcardPattern { <# .SYNOPSIS Returns a regular expression from an array of wildcard patterns. .DESCRIPTION Returns a regular expression from an array of wildcard patterns using PowerShell's WildcardPatternToRegexParser class. .PARAMETER Pattern Zero or more wildcard patterns to convert. .EXAMPLE ConvertFrom-WildcardPattern -Pattern AboutComp*, Returns the regular expression "^AboutComp". #> [CmdletBinding()] [OutputType([string])] param( [Parameter()] [SupportsWildcards()] [string[]] $Pattern ) $Parser = [PowerShell].Assembly.GetType('System.Management.Automation.WildcardPatternToRegexParser') $PatternBuilder = [StringBuilder]::new() foreach ($wildcardPattern in $Pattern) { $RegexPattern = $Parser::Parse( [WildcardPattern]::Get( $wildcardPattern, [WildcardOptions]::IgnoreCase ) ) if ($PatternBuilder.Length -gt 0) { $PatternBuilder.AppendFormat('|{0}', $RegexPattern.ToString()) > $null } else { $PatternBuilder.Append($RegexPattern) > $null } } $PatternBuilder.ToString() } |