Powershell script to remove git branches by pattern

Remove-GitBranch.ps1

function Remove-GitBranch {
    # Example:
    # Remove-GitBranch -regex feature           # remove local branches matching regex pattern
    # Remove-GitBranch -regex feature -origin   # remove local & origin branches

    param (
        [string] $regex,
        [switch] $origin # remove the origin branch?
    )

    $branches = @(
        git branch | ForEach-Object { $_.Trim() } | Where-Object {
            $_ -NotMatch '^master|^develop|\*' -and
            $_ -Match $regex
        }
    )

    Write-Host "Found" $branches.Length "branches"

    $branches = $branches | Where-Object {
        $answer = Read-Host ("Remove branch '$_'? [y/n]");
        $answer -eq 'y'
    }

    if ($branches.Length -eq 0) {
        return;
    }

    "The following branches will be removed:"
    $branches | ForEach-Object { Write-Host "`t$_" -ForegroundColor red }
    $answer = Read-Host ("Are you sure? [y/n]");

    if ($answer -ne 'y') {
        return
    }

    git branch --delete $branches

    if ($origin) {
        $allRemoteBranches = git branch --remote | ForEach-Object { $_.Trim() }
        $branchesToRemove = $branches | ForEach-Object {
            if ($allRemoteBranches.Contains("origin/$_")) {
                $_
            }
        }

        if ($branchesToRemove.Length -gt 0) {
            git push origin --delete $branchesToRemove
        }
    }
}