[cge]

This has been common for mailing addresses: with a parsing and validation system, the site will tell the user "We think you entered ... as your address; we think your address should be this: ...", along with options to keep the original entry or use the suggestion. This has the advantage of catching mistakes, not making unusual addresses unusual, and letting the user know if the site is interpreting what they entered in a way that won't actually work (eg, leaving off something important, or ordering components badly).