[racket] What do these symbols mean in Racket regexp documentation?

On May 7, 2013, at 5:14 PM, Don Green <infodeveloperdon at gmail.com> wrote:

> Can you apply the verbage that must be represented by the symbols in Racket regexp documentation shown below:
> ;;= means what?

"is one of" 


> | means what?

"or"


> <pces> means what?

a phrase described by the definition of pces 











> ---------------------------------------------------------------------------
>  
> ‹regexp›
>  ::=
> ‹pces›
>  
> Match ‹pces›
> 
>  
>  
> |
> ‹regexp›|‹regexp›
>  
> Match either ‹regexp›, try left first
>  ex1
> 
> 
> Thanks!
> Don Green
> 
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