Specifications for matching alternatives in a regex group?

[Bjoern Hoehrmann]

* David Sewell wrote:
>Given this query:
>
>let $string := "This is an introduction to XQuery"
>return (
>  replace($string, '(introduction|intro)', 'XXX'),
>  replace($string, '(intro|introduction)', 'XXX')
>)
>
>where both parts of the grouped expression are potential matches, is the
>alternative to be matched defined by specification, or
>implementation-dependent?

"If two alternatives within the pattern both match at the same position
in the $input, then the match that is chosen is the one matched by the
first alternative." -- section 7.6.3 fn:replace in F&O.
-- 
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