On Fri, Feb 17, 2012 at 3:48 AM, Heikki Linnakangas
<heikki.linnakan...@enterprisedb.com> wrote:
> Here's a wild idea: keep the class of each codepoint in a hash table.
> Initialize it with all codepoints up to 0xFFFF. After that, whenever a
> string contains a character that's not in the hash table yet, query the
> class of that character, and add it to the hash table. Then recompile the
> whole regex and restart the matching engine.
> Recompiling is expensive, but if you cache the results for the session, it
> would probably be acceptable.

What if you did this ONCE and wrote the results to a file someplace?

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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