The lexical elements of the grammar which defines network files are listed as regular expresions. The first column lists the name of the symbol, the second the regular expresion defining it. The third column may contain comments.
SPM_amp"&), and - defines a range of values. The class of digits is defined, e.g. as
SPM_ampx*& means, that the character or group x can occur zero or more times.
SPM_ampx+& means, that the character or group x must occur at least once, but may occur several times.
SPM_ampx?& means, that x can be omitted.
SPM_ampxn& means, that x has to occur exactly n times.
SPM_ampx|y& means, that either x or y has to occur.
SPM_amp& bind strongest,
SPM_amp?& is second,
SPM_amp|& binds weakest.