Re: Celko's Puzzle Number 5

> http://www.postgresql.org/docs/8.1/interactive/functions-matching.html
> 
> Any of these CHECK expressions should work:
> 
>   CHECK (alpha_only SIMILAR TO '[A-Za-z]+')
>   CHECK (alpha_only ~ '^[A-Za-z]+$')
>   CHECK (alpha_only ~* '^[a-z]+$')
> 
> Unfortunately, even though SIMILAR TO has been standard SQL for
> several years, not all databases implement it.  Many databases
> do support regular expressions but generally via a non-standard
> syntax (as PostgreSQL does with its ~, ~*, !*, and !~*  operators).

Thanks for the link!

Regards,

Richard Broersma Jr.