Find the index of the n-th occurence of a pattern (or a single character) in a string.

IndexOfNth.psq1

<#
    Find the n-th occurence of a pattern in a string
#>

function IndexOfNth
{
    param (
        [string]$String,
        [string]$Pattern,
        [int]$Occurence
    )

    $previousPos = 0
    $pos = -1

    for ($i = 1; $i -le $Occurence; $i++)
    {
        $previousPos = $pos + 1

        $pos = $String.IndexOf($Pattern, $previousPos)
    }

    return $pos
}