| # note: this might be incomplete, mostly an example | |
| root ::= en-char+ ([ \t\n] en-char+)* | |
| en-char ::= letter | digit | punctuation | |
| letter ::= [a-zA-Z] | |
| digit ::= [0-9] | |
| punctuation ::= [!"#$%&'()*+,-./:;<=>?@[\\\]^_`{|}~] | |
| # note: this might be incomplete, mostly an example | |
| root ::= en-char+ ([ \t\n] en-char+)* | |
| en-char ::= letter | digit | punctuation | |
| letter ::= [a-zA-Z] | |
| digit ::= [0-9] | |
| punctuation ::= [!"#$%&'()*+,-./:;<=>?@[\\\]^_`{|}~] | |