re = /<iframe[^>]*?title=(\\\'|\\"|[\'"])([^>]*?)\1/m
str = '<img src="..." title="title"/>
\'<iframe src="..." title="title" width="324" height="auto"/>\'
"<iframe src=\'...\' width=\'324\' height=\'auto\' title=\'title\' ></iframe>"
"<iframe src=\\"...\\" title=\\"title\\" width=\\"324\\" height=\\"auto\\"/>"
\'<iframe src=\\\'...\\\' width=\\\'324\\\' height=\\\'auto\\\' title=\\\'title\\\' ></iframe>\'
"<iframe src=\\"...\\" title=\\"title\'s with apostrophe\\" width=\\"324\\" height=\\"auto\\"/>"
"<iframe src=\'...\' width=\'324\' height=\'auto\' title=\'title \\"quoting\\" something\' ></iframe>"
'
# 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