grep 'RE botch' error

[John Sloan]

> >	grep '[' file
> >
> >	gives a 'RE botch' error on our VAX-750 running 4.2BSD.
> >Narendra Mehta, 
> That's not a bug, '[' is special to grep, try '\[' to escape it.
> 	-Barry Shein, Boston University

There is still a bug though: while [ is a special pattern operator to grep,
a single [ as in the example causes my 4.2BSD grep to go into a loop issuing
the "RE botch" error over and over. So while the error message is legitimate,
the ungraceful nonrecovery is not.
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