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

Can you apply the verbage that must be represented by the symbols in Racket
regexp documentation shown below:

;;= means what?

| means what?

<pces> means what?

---------------------------------------------------------------------------



‹*regexp*›

 ::=

‹*pces*›



Match ‹*pces*›





|

‹*regexp*›|‹*regexp*›



Match either ‹*regexp*›, try left first

 ex1


 Thanks!

Don Green
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