What is better for splitting: complex regexp or many rules

What is better for splitting: complex regexp or many rules

[Kees de Bruin]

I have a list of people I receive e-mail from and I would like to know what
is better: have a split entry for each person or create a complex regular
expression that matches all the e-mail addresses? The number of people
range from between 5 and 40 for a single split.

Kind regards,

-- 
Kees de Bruin                                           Tasking Software BV
Software Engineer
---------------------------------------------------------------------------
telephone:  +31 33 455 85 84                            Tasking Software BV
fax:        +31 33 455 10 05                            Plotterweg 31
email:      kees_de_bruin@tasking.com                   3821 BB  Amersfoort
WWW:        http://www.tasking.com                      The Netherlands
CompuServe: GO TASKING
---------------------------------------------------------------------------
	     -----  Quality Development Tools Worldwide  -----
		    -----------------------------------

Re: What is better for splitting: complex regexp or many rules

[Lars Magne Ingebrigtsen]

Kees de Bruin <kees_de_bruin@tasking.nl> writes:

> I have a list of people I receive e-mail from and I would like to know what
> is better: have a split entry for each person or create a complex regular
> expression that matches all the e-mail addresses? The number of people
> range from between 5 and 40 for a single split.

I don't think it matters much.  Do whatever feels most comfortable to
you. 

-- 
  "Yes.  The journey through the human heart 
     would have to wait until some other time."

Re: What is better for splitting: complex regexp or many rules

[Danny Siu]

Kees de Bruin writes:

  KdB> I have a list of people I receive e-mail from and I would like to
  KdB> know what is better: have a split entry for each person or create a
  KdB> complex regular expression that matches all the e-mail addresses? The
  KdB> number of people range from between 5 and 40 for a single split.

  KdB> Kind regards,

I am using a single not-so-complex regexp for the mails that my Berkeley
friends send me.

((re-search-forward "^\\(To\\|[Cc][Cc]\\):.*\\(auluen@\\|beatrice@\\|bentse@\\|blam@\\|bonnieh@\\|burtonl@\\|fchan@\\|yiu@\\|jackchow@\\|jwong@\\|leric@\\|psyeung@\\|sfung@\\|stsf@\\|syang@\\|tonyc@\\|wleung@\\|wwwong@\\).*"
		       nil t)
    (list "Berkeley-HK-Friends"))

It's easy enough for me to add or remove entry in this regexp.

Anyone lisp expert knows the performace trade off btw two cases?

-- 
                                                                ^..^
 '/..\"                                                        ( oo )  )~
m( oo )m                                                         ,,  ,,
/=-=-=-=-=-=-=-=-=-=-=-==-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\
|  Danny Dick-Fung Siu                http://www-leland.stanford.edu/~dsiu |
|  Reference System Group             http://www.csua.berkeley.edu/~dsiu   |
|  Adobe Systems Incorporated       E-Mail:<dsiu@alumni.eecs.berkeley.edu> |
|       "What do you expect from a         <dsiu@leland.stanford.edu>      |
|          Cal. Berkeley grad.?"           <dsiu@adobe.com>                |
\=-=-=-=-=-=-=-=-=-=-=-==-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=/

Re: What is better for splitting: complex regexp or many rules

[Per Abrahamsen]

Danny Siu <dsiu@Adobe.COM> writes:

> Anyone lisp expert knows the performace trade off btw two cases?

Both cases are unlikely to be significant compared to the time used
for disk I/O when splitting mail.