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Thanks! Re: cleaning up a big regexp

From: Tory S. Anderson
Subject: Thanks! Re: cleaning up a big regexp
Date: Mon, 15 Sep 2014 10:42:33 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Okay. In my code I now have: 
(setq my-gnus-bulk-from-address-list '(""
                                      "")) ;; list of 
bulkmail addresses
(setq my-bulk-from (mapconcat (lambda (x) (concat "^From:.*" x)) 
my-gnus-bulk-from-address-list "\\|"))

(setq nnmail-split-methods
       '(("mail.bulk" my-bulk-from)

Looks much better and seems to work. It appends "From:.*" to each string and 
then combines them into a single string. Any suggestions for improvement are 
welcome; big thanks for the suggestions that helped me figure this out. 
regexp-opt will probably make this more efficient (especially for big lists), 
but I haven't figured out how to plug it in yet. 

Michael Albinus <address@hidden> writes:

> Stefan Monnier <address@hidden> writes:
>>> (mapconcat `regexp-quote my-gnus-bulk-from-address-list "\\|"))
>> A.k.a (regexp-opt my-gnus-bulk-from-address-list)
> Not when the strings contain meta characters like "*". I repeat it again
> and again, because I've entered this trap very recently. See commit
> trunk r117880, where I refuse to tell that I have been an idiot.
>> -- Stefan
> Best regards, Michael.

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