I would like to check the that the $pattern argument to a
regular expression in fact follows regular expression rules,
since regex is not castable I guess the only way to do this
would be to use regular expressions and perhaps a for-each to
check that the $pattern argument conforms?
Short of writing a regular expression that only matches valid regular
expressions (which sounds like an interesting exercise for the reader), I
think you'll have to resort to extensions for this one.
Michael Kay
http://www.saxonica.com/
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