> A range operator with a regexp works like a flip flop (bistable
> multi
> vibrator or so).  The value of the internal flag (and thus the
> result of
> the evaluation) changes in this way: initiallly it's false.  If the
> first
> RE matches it's switched to true. It stays true as long as the
> second RE
> does not match.  If it does, the flag goes back to false.
> 
> while( line = gets )
>   if /BEGIN:VCARD/ =~ line .. /END:VCARD/ =~ line
>     puts line
>   end
> end


Did perl originate this idea?  I remember way back when in perl 4.0x
days when I figured out how that thing worked... it was one of those
"a-HA!" moments.  

Cool operator.

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