Standstill

Messages > Standstill

Despite of parsing, the position in the input wasn't changed.

A token, which matches the text, must match at least one character. A token like

Token A:: = a*

Production ::= A

would match at any position of the text, because the character 'a' will be there at least null times.  A production like  ( A )* would cause an endless loop. An optional occurrence of a concatenation of 'a'-characters should be written as:

Token A ::= a+

Production ::= ( A )?

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