re = /^\s*<p>\s*(?:<\/?\w+\/?>\s*)*<a href=\"(?:(?:[a-z]+:)?\/\/(?:[^\" >\/.]*\.)*(?:youtube\.com|youtu\.be)[\/\"])\W*(?![\W\w]*?<\/(?:code|blockquote)>)(?#Separate start with youtube watch; lower TP rate, but most TP are not otherwise detected)/m
str = ''
# Print the match result
str.scan(re) do |match|
puts match.to_s
end
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html