youtube-html-parser-to-simple-uri-and-title

#!/bin/sh
#
# YouTube HTML parser:
# to output a list of simple URIs and titles.
#
# Syntax:
#
#     cat example.html | youtube-html-to-simple-uri-and-title
#
# ## Example
#
# Example input such as a typical YouTube list of related videos:
#
#     <a href="/watch?v=100" ... title="Lorem ipsum" ... >
#     <a href="/watch?v=200" ... title="Dolor sit amet" ... >
#     <a href="/watch?v=300" ... title="Consectetur adipiscing" ... >
#
# Example output:
#
#     https://www.youtube.com/watch?v=100 Lorem ipsum
#     https://www.youtube.com/watch?v=200 Dolor sit amet
#     https://www.youtube.com/watch?v=300 Consectetur adipiscing
#
# Example that selects matching title text, then sorts by the title field:
#
#     cat example.html |
#     youtube-html-parser-to-simple-uri-and-title |
#     grep -i 'best of' |
#     sort -k2
#
# ## Implementation
#
# This implementation does quick-and-dirty parsing of real world HTML.
#
# TODO: upgrade from simple grep to real HTML parsing.
#
# Command: youtube-html-parser-to-simple-uri-and-title
# Version: 1.1.0
# Created: 2010-10-15
# Updated: 2016-02-09
# License: GPL
# Contact: Joel Parker Henderson (joel@joelparkerhenderson.com)
##
set -euf
grep '/watch?v=.* title=' | sed 's#.*\(/watch?v=[^"]*\).* title="\([^"]*\).*#http://www.youtube.com\1 \2#'