Matthew Seaman wrote:
Drew Tomlinson wrote:
Matthew Seaman wrote:
% perl -p -e 's/cn=([^ ,]+) ([^,]+),/cn=$2 $1,/' < foo.txt
I still don't really understand *why* the above works but I'm trying
to pick it apart now.
The RE breaks down like this:
/cn=([^ ,]+) ([^,]+),/
cn= Match literal text 'cn='
( capture #1 begin
[^ ,] Character class: anything that is not space or
comma
+ At least one of the above
) end capture #1
Match a literal space
( capture #2 begin
[^,] Character class: anything that is not a comma
+ At least one of the above
) end capture #2
, Match literal comma
Thank you for that. You've shown me a new way to look at things.
Instead of worrying about what I want to match, determine what marks the
beginning and end of what I want to match and use negated character
classes to find those end points. I think my regex writing has just
gotten better. :)
Cheers,
Drew
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