如何将这一行从PHP转换为Ruby？

Question

I have trouble with converting the following line from PHP to Ruby:

strtolower(preg_replace(array('/[^a-zA-Z0-9 -]/', '/[ -]+/', '/^-|-$/'), array('', '-', ''), trim($str)));

Is it possible to accomplish this in one line just like in here?

Answer 1

str.strip.gsub(/[^a-zA-Z0-9 -]/, '').gsub(/[ -]+/, '-').gsub(/^-|-$/, '').downcase

could be further simplified to:

str.strip.gsub(/[ -]+/, '-').gsub(/[^a-z \d-]|^-|-$/i, '').downcase