regexp

[Peter L. Peres]

Hi all, I am trying to write a regexp that matches something like:

abc=def and anything else instead of def, but not:

abc=fgh

so I try to use negation on a block (conceptually below, it is not a
correct re):

/abc=!(fgh)

and it does not seem to be possible. I read the regex[p]+ manual and I
cannot find a reference to block negation. Is this not a part of normal
regexps ? (as implemented by Hentry Spencer f.ex.) ?

References seen so far:

man 3 regex
man 7 regex
man ed
man n regexp
man n re_syntax
Mastering Regular Expressions (O'Reilly 1998 ed.)
[g]+awk book online

The closest I've come to is a negative lookahead which is not available in
regular regexps. Am I correct to say that a negative lookahead is the only
way to produce the effect I need ?

tia,
Peter
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