#!/bin/sh
# urls - output all urls

grep -P -o '(?:https?://|ftp://|news://|mailto:|file://|\bwww\.)[a-zA-Z0-9\-\@;\/?:&=%\$_.+!*\x27,~#]*(\([a-zA-Z0-9\-\@;\/?:&=%\$_.+!*\x27,~#]*\)|[a-zA-Z0-9\-\@;\/?:&=%\$_+*~])+' "$@"