Re: Detecting the presence of a pattern in an atom

Thanks everyone for the help, I've got it working now with the simple DCG.
I had only written a DCG once before about ten years ago when I added a natural 
language parser to my home automation system - it's still running in my house, 
but it's been so long I forgot the basics.

I'm mostly a Java programmer in my day job, but when this task came along I knew 
it was time to introduce SWI Prolog to the office.  The ability to pattern match 
the structure of a web page to extract just what I needed would have been awful 
to write in any other language, but was about 100 lines of Prolog.

Steve

> Example:
>
>     %?- in_parentheses("acme ltd (HELLO) 123 (TEST)", X).
>     %@ X = 'HELLO' ;
>     %@ X = 'TEST' ;
>     %@ false.
>
> All the best,
> Markus