[cl-ppcre-devel] Prioritising matches by the order of the alternatives.

[Edi Weitz]

Possible, but probably extremely inefficient.  Here's an idea:

CL-USER 3 > (ppcre:scan-to-strings "dog|man" "a man and his dog")
"man"
#()

CL-USER 4 > (ppcre:scan-to-strings "dog|man(?!.*dog)" "a man and his dog")
"dog"
#()

Edi.

On Wed, Jun 23, 2010 at 4:50 PM, David Johnson-Davies
<david at interface.co.uk> wrote:
> Is it possible to prioritise matches by the order of the alternatives?
>
> This demonstrates what I want to do:
>
> (cl-ppcre::scan-to-strings "super(man|dog|girl|woman|boy)" "this is the story of superboy and superman.")
>
> This matches "superboy" because it matches the first "super" and then tries each of the ORs until it finds "boy".
>
> What I want it to do is match according to the priority I've specified in the OR list. For example, if it finds a "superman" anywhere in the target-string it should match that before trying "superdog" etc.
>
> I know I could do this with a bit of Lisp code, but if it's possible to keep it all in the regexp I'd prefer to do that.
>
> Thanks,
> David Johnson-Davies
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