[regexp] support \p in character classes.

test/mjsunit/harmony/regexp-property-char-class.js

+// Copyright 2011 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-unicode-regexps --harmony-regexp-property
+
+assertThrows("/[\\p]/u");
+assertThrows("/[\\p{garbage}]/u");
+assertThrows("/[\\p{}]/u");
+assertThrows("/[\\p{]/u");
+assertThrows("/[\\p}]/u");
+assertThrows("/[\\p{Math}]/u");
+assertThrows("/[\\p{Bidi_M}]/u");
+assertThrows("/[\\p{Hex}]/u");
+
+assertTrue(/^[\p{Lu}\p{Ll}]+$/u.test("ABCabc"));
+assertTrue(/^[\p{Lu}-\p{Ll}]+$/u.test("ABC-abc"));
+assertFalse(/^[\P{Lu}\p{Ll}]+$/u.test("ABCabc"));
+assertTrue(/^[\P{Lu}\p{Ll}]+$/u.test("abc"));
+assertTrue(/^[\P{Lu}]+$/u.test("abc123"));
+assertFalse(/^[\P{Lu}]+$/u.test("XYZ"));
+
+assertTrue(/^[^\P{Lu}]+$/u.test("XYZ"));
+assertFalse(/^[^\p{Lu}\p{Ll}]+$/u.test("abc"));
+assertFalse(/^[^\p{Lu}\p{Ll}]+$/u.test("ABC"));
+assertTrue(/^[^\p{Lu}\p{Ll}]+$/u.test("123"));
+assertTrue(/^[^\p{Lu}\P{Ll}]+$/u.test("abc"));