On Tue, 14 Nov 2000, Lee Howard wrote:
> sed -e "s/\(^.TH*\)4F/\14/g"
>
> be rewritten so that we don't use the \(matching\) as the \1 crashes on
> some SCO and Solaris versions of sed. ???
Just to make sure i'm grokking this right...
Your looking for...
^.T - any occurance of T as the second letter followed by
H* - any number of H's (including none) followed by
4F - a literal "4F"
... and you want to replace it with...
\1 - the same ^.TH* sequence that was found and
4 - the number 4.
... so basically the F gets dropped.
Sounds like their sed is no fun all... do the same thing with perl?
perl -p -e 's/(^.TH*)4F/${1}4/'
Exaclty the same regular expression except perl assumes ()'s are special so
we don't need to quote them and the $1 (first match) needs to be protected
with {} otherwise perl thinks we mean the 14th match as it allows more
than the 9 sed gives us.
Assuming you're stuck with sed that doesn't really help you at all. Sorry
'bout that... cant see any way to re-write your regex and still do the same
thing.
M.
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