URL safe characters RegEx that will allow UTF-8 accents!

I'm looking for a RegEx pattern to use in a rereplace() function that will keep URL safe characters, but include UTF-8 characters with accents. For example: ç and ã.

Something like: url = rereplace(local.url, "pattern") etc. I pref开发者_开发技巧er a ColdFusion only solution, but I'm open to using Java too since it's so easy to integrate with CF.

My URL pattern will look like: /posts/[postId]/[title-with-accents-like-ç-and-ã]

I don't know what language you are using. Perl has some utf8 matching, see for example Tatsuhiko Miyagawa's URI::Find::UTF8

This can be done by matching alpha numeric characters using \w.

rereplace(string, "[^\w]", "", "all")

See this answer for reference.