#!/bin/bash

URL="https://www.zlib.net/pigz/"

# Get version number from FTP server
VERSION=$(curl -s -L "$URL" | grep -o -P 'pigz-([\d.]+).tar.gz')

# Remove prefix
VERSION=${VERSION//pigz-/}

# Remove '.tar.gz' suffix from VERSION variable
VERSION=${VERSION//.tar.gz/}

echo "$VERSION"