PO SMTP filter regexp documentation

On 6/27/03 6:48 PM, "Eric Yang" <eyang@xxxxxxxxx> wrote:

> This is probably what you were looking for:
> 
> http://www.tenon.com/faq/faq.php?display=faq&nr=8&catnr=18&prog=3.5.3&lang=en&;
> onlynewfaq=1 
> 
> regards, 
> Eric 

Thanks for  the link Eric, but I've seen that and I know pretty much how to
construct a regexp.

What I need to know is how regexp is implemented in PO and what to watch out
for and how it is different and whether there is an error log that will tell
me that my regexp is badly constructed, whether backreferences are
supported, etc...

Basically, I know how to write a regexp for the grep/egrep command in the
shell, but when I try to port the regexp directly to PO SMTP filters they
don't work until I tweak them.

For example, .* (dot star) does not function the same, the regexp seems to
need a wildcard/globbing-style definition like * (star), repetition
operators (like {5} curly brackets) that are supported in egrep do not work
which leads me to believe that egrep functionality is not supported, and so
forth...

I want to know what capabilities I can expect to get from regexp in PO SMTP
filters without banging my head against the wall a hundred times and writing
the documentation myself from scratch.

Assuming that Tenon wrote the functionality into PO to do SMTP filters in
the first place, I also assume that there is some documentation about what
regexp level it supports. Maybe you used a well-known library? Maybe you
wrote it in assembly?

Here is a nice link that lays out the chart of various regexp
implementations:

http://www.greenend.org.uk/rjk/2002/06/regexp.html

It covers:
GNU grep    BRE (grep)    ERE (egrep)    GNU Emacs    Perl    Python    Tcl

This page may help us communicate about this issue.

Thanks!!
dan

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