grammars : add English-only grammar (#10612)

diff --git a/grammars/english.gbnf b/grammars/english.gbnf
new file mode 100644 (file)
index 0000000..2e53686
--- /dev/null
+++ b/grammars/english.gbnf
@@ -0,0 +1,6 @@
+# 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 ::= [!"#$%&'()*+,-./:;<=>?@[\\\]^_`{|}~]