Need some sed help

[Dazed_75]

Thanks guys.  I must not be doing what you suggest correctly or maybe I did
not describe the problem well (to edit the chosen lines in place in the
source file).  In any case, after experimenting on a copy of the file
without success I went ahead and did the edits manually to get the job
done.  I hope neither of you spent too much time on it but I do appreciate
the effort.


On Tue, Jul 2, 2013 at 7:08 AM, der.hans <PLUGd at lufthans.com> wrote:

> Am 02. Jul, 2013 schwätzte Dazed_75 so:
>
> moin moin,
>
>
>  I have some C code with lines that look like:
>> stuff1; stuff2; spPtr+=stuff3; maybesomestuff4
>>
>> I can find only the lines of interest using grep spPtr+=foo.c but I
>> wondered if I could easily use sed to convert those lines to
>> stuff1; spPtr+=stuff3; stuff2; maybesomestuff4
>>
>> so basically with ; as a delimiter, swapping group 2 and 3 but only for
>> those lines containing "spPtr+="
>>
>> Any ideas?
>>
>
> $ echo "1; 2; 3; 4;" | sed -re 's/^([^;]+;)([^;]+;)([^;]+;)/\**1\3\2/'
> 1; 3; 2; 4;
> $
>
> Combining the 3 capture groups into one is left as an exercise for the
> reader :).
>
> Obviously, if any of the fields contain a ;, then that match won't do what
> you're wanting on that line.
>
> ciao,
>
> der.hans
> --
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-- 
Dazed_75 a.k.a. Larry

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