# [EMAIL PROTECTED] / 2002-12-18 13:41:37 +0000:
> On Wed, Dec 18, 2002 at 01:29:59PM +0200, Malik Bülent wrote:
>
> > I have a file.
> > How can I backspace 5 character that start with expressions(the expression
> > starts /aaa) in a file ?
> > for example my file;
> > " /aaa/yy/
> > /aaa/..
> > "
>
> If you mean "how can I delete each instance of 5 characters starting
> with /aaa from a file", then something like this should do it:
>
> perl -pi.bak -e 's:/aaa.::g;' filename
>
> which deletes the /aaa and the following (fifth) character. If you
> mean to delete the 5 characters immediately *following* /aaa then:
>
> perl -pi.bak -e 's:(?<=/aaa).{5}::g' filename
sed -i.bak 's:/aaa.::g' filename
sed -Ei.bak 's:(/aaa).{5}:\\1:g' filename
would probably be quite faster (neither tested)
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