#!/bin/sh

# Find all url in stdin, print them newline-separated to stdout

# Old regex (PCRE), kept it for later review:
# reg='(((http|https|ftp)|mailto)[.:][^ >"\t]*|www\.[-a-z0-9.]+)[^ .,;\t>">\):]'
# grep -Po "$reg"

protocols='http|https|ftp|gemini|mailto'
valid_chars="][a-zA-Z0-9_~/?#@!$&'()*+=.,;:-"
regex="(($protocols):|www\.)[$valid_chars]+"

egrep -o "$regex"