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@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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