JSTests/test262/test/built-ins/RegExp/named-groups/unicode-property-names.js

// Copyright 2017 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: Exotic named group names in Unicode RegExps
esid: prod-GroupSpecifier
features: [regexp-named-groups]
---*/

assert.sameValue("a", /(?<π>a)/u.exec("bab").groups.π);
assert.sameValue("a", /(?<\u{03C0}>a)/u.exec("bab").groups.π);
assert.sameValue("a", /(?<π>a)/u.exec("bab").groups.\u03C0);
assert.sameValue("a", /(?<\u{03C0}>a)/u.exec("bab").groups.\u03C0);
assert.sameValue("a", /(?<$>a)/u.exec("bab").groups.$);
assert.sameValue("a", /(?<_>a)/u.exec("bab").groups._);
assert.sameValue("a", /(?<$𐒤>a)/u.exec("bab").groups.$𐒤);
assert.sameValue("a", /(?<_\u200C>a)/u.exec("bab").groups._\u200C);
assert.sameValue("a", /(?<_\u200D>a)/u.exec("bab").groups._\u200D);
assert.sameValue("a", /(?<ಠ_ಠ>a)/u.exec("bab").groups.ಠ_ಠ);
assert.throws(SyntaxError, () => eval('/(?<❤>a)/u'));
assert.throws(SyntaxError, () => eval('/(?<𐒤>a)/u'), "ID_Continue but not ID_Start.");

// Unicode escapes in capture names.
assert(/(?<a\uD801\uDCA4>.)/u.test("a"), "\\u Lead \\u Trail");
assert.throws(SyntaxError, () => eval("/(?<a\\uD801>.)/u"), "\\u Lea");
assert.throws(SyntaxError, () => eval("/(?<a\\uDCA4>.)/u"), "\\u Trai");
assert(/(?<\u0041>.)/u.test("a"), "\\u NonSurrogate");
assert(/(?<\u{0041}>.)/u.test("a"), "\\u{ Non-surrogate }");
assert(/(?<a\u{104A4}>.)/u.test("a"), "\\u{ Surrogate, ID_Continue }");
assert.throws(SyntaxError, () => eval("/(?<a\\u{110000}>.)/u"), "\\u{ Out-of-bounds ");
assert.throws(SyntaxError, () => eval("/(?<a\uD801>.)/u"), "Lea");
assert.throws(SyntaxError, () => eval("/(?<a\uDCA4>.)/u"), "Trai");
assert(RegExp("(?<\u{0041}>.)", "u").test("a"), "Non-surrogate");
assert(RegExp("(?<a\u{104A4}>.)", "u").test("a"), "Surrogate,ID_Continue");

// Bracketed escapes are not allowed;
// 4-char escapes must be the proper ID_Start/ID_Continue
assert.throws(SyntaxError, () => eval("/(?<a\\uD801>.)/u"), "Lead");
assert.throws(SyntaxError, () => eval("/(?<a\\uDCA4>.)/u"), "Trail");
assert((/(?<\u{0041}>.)/u).test("a"), "Non-surrogate");
assert(/(?<a\u{104A4}>.)/u.test("a"), "Surrogate, ID_Continue");
assert(RegExp("(?<\\u0041>.)", "u").test("a"), "Non-surrogate");

// Backslash is not allowed as ID_Start and ID_Continue
assert.throws(SyntaxError, () => eval("/(?<\\>.)/u"), "'\' misclassified as ID_Start");
assert.throws(SyntaxError, () => eval("/(?<a\\>.)/u"), "'\' misclassified as ID_Continue");