lark-parser
diff --git a/‎larkjs/lark.js
+2-1 b/‎larkjs/lark.js
+2-1
@@ -306,7 +306,7 @@ function list_repeat(list, count) {
 }
 
 function isupper(a) {
-  return /^[A-Z_$]*$/.test(a);
+  return /^[^a-z]*[A-Z][^a-z]*$/.test(a);
 }
 
 function rsplit(s, delimiter, limit) {
@@ -3981,4 +3981,5 @@ module.exports = {
   Indenter,
   PythonIndenter,
   get_parser,
+  isupper,
 };
Original file line number	Diff line number	Diff line change
`@@ -306,7 +306,7 @@ function list_repeat(list, count) {`
`306`	`306`	`}`
`307`	`307`
`308`	`308`	`function isupper(a) {`
`309`		`- return /^[A-Z_$]*$/.test(a);`
	`309`	`+ return /^[^a-z][A-Z][^a-z]$/.test(a);`
`310`	`310`	`}`
`311`	`311`
`312`	`312`	`function rsplit(s, delimiter, limit) {`
`@@ -3981,4 +3981,5 @@ module.exports = {`
`3981`	`3981`	`Indenter,`
`3982`	`3982`	`PythonIndenter,`
`3983`	`3983`	`get_parser,`
	`3984`	`+ isupper,`
`3984`	`3985`	`};`