Functions/Measure-Char.ps1
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function Measure-Char { <# .SYNOPSIS To count the number of times a character appears in a string, or an array of strings. .DESCRIPTION To count the number of times a character appears in a string, or an array of strings. By default the function is case sensitive, but can be controlled with the $IgnoreCase switch. Can also optionally include the command line parameters passed to the program with the $IncludeInput switch .PARAMETER String A string, or an array of strings to count character against. Can accept pipeline input. .PARAMETER Char The individual character that you wish to count occurrences of. .PARAMETER IgnoreCase By default this function is case sensitive and this switch makes the function case insensitive. .PARAMETER IncludeInput A switch to display the parameters specified when the function was called and the resulting count. Aliased to 'IncludeOriginal' .EXAMPLE Measure-Char -String 'Password' -Char 'S' -IgnoreCase -IncludeInput Would return String Char IgnoreCase Count ------ ---- ---------- ----- Password S True 2 .EXAMPLE Measure-Char -String 'Password' -Char 'S' Would return 0 as the function by default is case sensitive. #> [cmdletbinding()] param( [parameter(Mandatory, ValueFromPipeline, Position = 0)] [string[]] $String, [parameter(Mandatory, Position = 1)] [char] $Char, [switch] $IgnoreCase, [Alias('IncludeOriginal')] [switch] $IncludeInput ) begin { Write-Verbose -Message "Starting [$($MyInvocation.Mycommand)]" [char[]] $CharArray = @() [string] $DisplayString = '' } process { foreach ($CurrentString in $String) { $CharArray += ([char[]] $CurrentString) if ($DisplayString -eq '') { $DisplayString = $CurrentString } else { $DisplayString = @($DisplayString, $CurrentString) -join ' ' } } } end { if ($IgnoreCase) { $ReturnValue = ($CharArray | Where-Object { $_ -match $Char } | Measure-Object ).count } else { $ReturnValue = ($CharArray | Where-Object { $_ -cmatch $Char } | Measure-Object ).count } if ($IncludeInput) { New-Object -TypeName 'pscustomobject' -Property ([ordered] @{ String = $DisplayString Char = $Char IgnoreCase = $IgnoreCase Count = $ReturnValue }) } else { Write-Output -InputObject $ReturnValue } Write-Verbose -Message "Ending [$($MyInvocation.Mycommand)]" } } |