Bug fix for number only escapes in escape-case rule (#86)

Author: Bebersohl

rules/escape-case.js

@@ -1,5 +1,6 @@
 'use strict';
 const escapeWithLowercase = /\\(x[a-f0-9]{2}|u[a-f0-9]{4}|u\{([0-9a-f]{1,})\}|c[a-z])/;
+const hasLowercaseCharacter = /[a-z].*?[a-z]/;
 const message = 'Use uppercase characters for the value of the escape sequence.';
 
 const fix = value => {
@@ -16,7 +17,7 @@ const fix = value => {
 const create = context => {
 	return {
 		Literal(node) {
-			if (typeof node.value === 'string' && node.raw.match(escapeWithLowercase)) {
+			if (typeof node.value === 'string' && node.raw.match(escapeWithLowercase) && node.raw.match(hasLowercaseCharacter)) {
 				context.report({
 					node,
 					message,
@@ -25,7 +26,7 @@ const create = context => {
 			}
 		},
 		TemplateElement(node) {
-			if (typeof node.value.raw === 'string' && node.value.raw.match(escapeWithLowercase)) {
+			if (typeof node.value.raw === 'string' && node.value.raw.match(escapeWithLowercase) && node.value.raw.match(hasLowercaseCharacter)) {
 				context.report({
 					node,
 					message,

test/escape-case.js

@@ -30,7 +30,9 @@ ruleTester.run('escape-case', rule, {
 		'const foo = `${"\uD834 foo"} \\uD834`;',
 		'const foo = "\\uD834foo";',
 		'const foo = "foo\\uD834";',
-		'const foo = "foo \\uD834";'
+		'const foo = "foo \\uD834";',
+		'const foo = "\\u2500";',
+		'const foo = "\\x46";'
 	],
 	invalid: [
 		{