Transform XSD complexType into regular expressions

Michael Kay wrote:
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I've considered the approach of validating complex types by turning them into regular expressions against a string and using a regex engine. The main reason I decided against it is that regex engines produce no useful diagnostics; they just tell you the string doesn't match. Perhaps the answer to that would be to write a regex engine with better diagnostics - I can see that being useful!
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Oh, that sounds wicked cool. Michael, would you describe at a high level how one would go about converting a complexType into regular expressions, please? Would one complexType be transformed into one regular expression or into multiple regular expressions?

/Roger