[cl-ppcre-devel] report a bug

[Chris Dean]

Xiangjun Wu <netawater at gmail.com> writes:
> (cl-ppcre:scan
>               (cl-ppcre:create-scanner
>                  "(_\\w+)*\\@\\w+") "______________________________________"
>                           :start 0)
>


Perhaps 

  (cl-ppcre:create-scanner "(_[_\\w]+)?@\\w+")

will work for your app?  The problem in the original expression is the
"+" followed by the "*" can lead to a combinatorial explosion.

If you loosen the requirement that all non-zero matches in the first
expression must begin with an "_" you could have:

  (cl-ppcre:create-scanner "[_\\w]*@\\w+")

Cheers,
Chris Dean