shortest match regexp operator anyone?

Donal K. Fellows fellowsd at
Thu Jul 12 11:24:46 CEST 2001

Harald Kirsch wrote:
> 2) TASK: Find the first '<A>' and match, if it is followed by a 'B'
>    SOLUTION: ???
> An approximation for (2) is '^[^<>A]+<A>B', but it does not match
> 'A<A>B', which it should.

This isn't purely a regexp, but it is a one-liner:

  if {[regexp -indices {<A>(B)?} $string matched gotB]&&[lindex $gotB 0]+1} {

Donal K. Fellows    fellowsd at
-- Actually, come to think of it, I don't think your opponent, your audience,
   or the metropolitan Tokyo area would be in much better shape.
                                        -- Jeff Huo <jeff at>

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