Update regex-shorthand to ignore regex with u flag

rules/regex-shorthand.js

@@ -9,12 +9,18 @@ const message = 'Use regex shorthands to improve readability.';
 const create = context => {
 	return {
 		'Literal[regex]': node => {
-			const {type, value} = context.getSourceCode().getFirstToken(node);
+			const {type, value, regex} = context.getSourceCode().getFirstToken(node);
 
 			if (type !== 'RegularExpression') {
 				return;
 			}
 
+			// Regex with `u` flag is not well handled by `regexp-tree`
+			// https://github.com/DmitrySoshnikov/regexp-tree/issues/162
+			if (regex.flags.includes('u')) {
+				return;
+			}
+
 			let parsedSource;
 			try {
 				parsedSource = parse(value);

test/regex-shorthand.js

@@ -3,11 +3,8 @@ import avaRuleTester from 'eslint-ava-rule-tester';
 import rule from '../rules/regex-shorthand';
 
 const ruleTester = avaRuleTester(test, {
-	env: {
-		es6: true
-	},
 	parserOptions: {
-		sourceType: 'module'
+		ecmaVersion: 2020
 	}
 });
 
@@ -31,7 +28,15 @@ ruleTester.run('regex-shorthand', rule, {
 		'const foo = new RegExp(/\\d/ig)',
 		'const foo = new RegExp(/\\d/, \'ig\')',
 		'const foo = new RegExp(/\\d*?/)',
-		'const foo = new RegExp(/[a-z]/, \'i\')'
+		'const foo = new RegExp(/[a-z]/, \'i\')',
+
+		// Should not crash ESLint (#446 and #448)
+		'/\\{\\{verificationUrl\\}\\}/gu',
+		'/^test-(?<name>[a-zA-Z-\\d]+)$/u',
+
+		// Should not suggest wrong regex (#447)
+		'/(\\s|\\.|@|_|-)/u',
+		'/[\\s.@_-]/u'
 	],
 	invalid: [
 		{