search for a regex pattern in files, alternative to Select-String

Find-String.ps1

using namespace System.IO

function Find-String {
param(
    [parameter(ValueFromPipeline, Mandatory)]
    [Alias('PSPath')]
    [FileInfo]$Path,
    [parameter(Mandatory, Position = 0)]
    [regex]$Pattern,
    [switch]$AllMatches,
    [int[]]$Context
)

    process {
        $content = [File]::ReadAllText($Path)
        $match = if($AllMatches.IsPresent) {
            $Pattern.Matches($content)
        }
        else {
            $Pattern.Match($content)
        }

        if($match.Success -notcontains $true) {
            return
        }

        foreach($m in $match) {
            $out = [ordered]@{
                Path   = $path.FullName
                Value  = $m.Value
                Index  = $m.Index
                Length = $m.Length
            }

            if($PSBoundParameters.ContainsKey('Context')) {
                $before        = $m.Index
                $after         = $m.Index + $m.Length
                $contextBefore = $Context[0]
                $contextAfter  = $Context[1]

                while($contextBefore-- -and $before) {
                    $before--
                }
                while($contextAfter-- -and $after -lt $content.Length) {
                    $after++
                }
                $out.Context = (-join $content[$before..$after]).Trim()
            }

            [pscustomobject]$out
        }
    }
}