Re: w/ascii and w/unicode

[Alex Shinn <alexshinn@xxxxxxxxx>]

On Thu, Oct 17, 2013 at 12:33 PM, Michael Montague <mikemon@xxxxxxxxx> wrote:

Why are w/ascii and w/unicode necessary? The ascii character set can be used instead.

(regexp-search `(: bos (* ,char-set:ascii) eos) "English") => #<rx-match>
(regexp-search `(: bos (* ,char-set:ascii) eos) "Ελληνική") => #f

You seem to be misunderstanding these operators.  They apply

to all contained patterns.  The examples you are referring to

are operating on the "letter" character class.  You could, if you

wanted, use intersection to restrict individual sets to ASCII-only:

(regexp-search `(: bos (* (& ascii letter)) eos) "English") => #<rx-match>
(regexp-search `(: bos (* (& ascii letter)) eos) "Ελληνική") => #f

(regexp-search `(: bos (* letter) eos) "Ελληνική") => #<rx-match>

However, this needs to be duplicated multiple times if there

are multiple nested csets, and is in fact impossible if the nested

cset is part of an external SRE, e.g. you can't do this here:

(import (only (mystuff regexp-common) rx:plurals))

(regexp-search `(w/ascii ,rx:plurals) "...")

-- 

Alex