why can't this be parsed?

[zpdDG4gta8XKpMCd]

@dmajda

gammar

// from RFC 2396
domainlabel = 'a' / ('a' ('a' / '-')* 'a')

input

aa

can't parse, why?

[gguerreiro]

The rule ('a' / '-')* will try to match the longest string possible, so it will match 'aa' leaving no chars.

RFC 2396 domainlabel rule can be rewritten as

domainlabel = $([a-zA-Z] [a-zA-Z0-9]* ('-'+ [a-zA-Z0-9]+)*)

Also, take a look at Parsing Expression Types to check the rules PEG.js supports.

[zpdDG4gta8XKpMCd]

thanks