What is a good complete regular expression or some other process that would take the title:

How do you change a title to be part of the URL like Stack Overflow?

and turn it into

how-do-you-change-a-title-to-be-part-of-the-url-like-stack-overflow

that is used in the SEO-friendly URLs on Stack Overflow?

The development environment I am using is Ruby on Rails, but if there are some other platform-specific solutions (.NET, PHP, Django), I would love to see those too.

I am sure I (or another reader) will come across the same problem on a different platform down the line.

I am using custom routes, and I mainly want to know how to alter the string to all special characters are removed, it’s all lowercase, and all whitespace is replaced.

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