Why no RE match of A AND B?

Erik Max Francis max at alcyone.com
Mon Mar 3 01:13:55 CET 2003


"Anders J. Munch" wrote:

> It can always be reformulated as an expression without an intersection
> ('&') operator.  But not necessarily a simpler one.
> 
> BIMBW?
> 
> I've never understood either why the intersection operator is usually
> missing from regular expression implementations.  Tradition?

Probably for the reason you mention:  It can easily be reexpressed as
another regular expression, whether simpler or more complicated.  That
isn't true in general, for, say, the | regular expression operator

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