RegExp#unicode implementation and isUnicode

reg-exp/#/index.js

@@ -1,9 +1,10 @@
 'use strict';
 
 module.exports = {
-	isSticky: require('./is-sticky'),
-	match:    require('./match'),
-	replace:  require('./replace'),
-	search:   require('./search'),
-	split:    require('./split')
+	isSticky:  require('./is-sticky'),
+	isUnicode: require('./is-unicode'),
+	match:     require('./match'),
+	replace:   require('./replace'),
+	search:    require('./search'),
+	split:     require('./split')
 };

reg-exp/#/is-unicode.js

@@ -0,0 +1,9 @@
+'use strict';
+
+var validRegExp = require('../valid-reg-exp')
+
+  , re = /\/[a-xz]*u[a-xz]*$/;
+
+module.exports = function () {
+	return Boolean(String(validRegExp(this)).match(re));
+};

reg-exp/#/unicode/implement.js

@@ -0,0 +1,8 @@
+'use strict';
+
+var isUnicode = require('../is-unicode');
+
+if (!require('./is-implemented')()) {
+	Object.defineProperty(RegExp.prototype, 'unicode', { configurable: true,
+		enumerable: false, get: isUnicode });
+}

reg-exp/#/unicode/is-implemented.js

@@ -0,0 +1,5 @@
+'use strict';
+
+module.exports = function () {
+	return RegExp.prototype.unicode === false;
+};

test/reg-exp/#/index.js

@@ -7,5 +7,6 @@ var indexTest = require('tad/lib/utils/index-test')
 module.exports = function (t, a, d) {
 	indexTest(indexTest.readDir(path).aside(function (data) {
 		delete data.sticky;
+		delete data.unicode;
 	}))(t, a, d);
 };

test/reg-exp/#/is-unicode.js

@@ -0,0 +1,10 @@
+'use strict';
+
+module.exports = function (t, a) {
+	var re;
+	a(t.call(/raz/), false, "Normal");
+	a(t.call(/raz/g), false, "Global");
+	try { re = new RegExp('raz', 'u'); } catch (ignore) {}
+	if (!re) return;
+	a(t.call(re), true, "Unicode");
+};

test/reg-exp/#/unicode/implement.js

@@ -0,0 +1,5 @@
+'use strict';
+
+var isImplemented = require('../../../../reg-exp/#/unicode/is-implemented');
+
+module.exports = function (a) { a(isImplemented(), true); };

test/reg-exp/#/unicode/is-implemented.js

@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = function (t, a) { a(typeof t(), 'boolean'); };