add t.notRegex (#879)

* add t.notRegex

Fixes #877

* add notRegex to power-assert patterns

lib/assert.js

@@ -142,6 +142,10 @@ x.regex = function (contents, regex, msg) {
 	test(regex.test(contents), create(regex, contents, '===', msg, x.regex));
 };
 
+x.notRegex = function (contents, regex, msg) {
+	test(!regex.test(contents), create(regex, contents, '!==', msg, x.notRegex));
+};
+
 x.ifError = x.error = function (err, msg) {
 	test(!err, create(err, 'Error', '!==', msg, x.ifError));
 };

lib/enhance-assert.js

@@ -13,6 +13,7 @@ module.exports.PATTERNS = [
 	't.deepEqual(value, expected, [message])',
 	't.notDeepEqual(value, expected, [message])',
 	't.regex(contents, regex, [message])',
+	't.notRegex(contents, regex, [message])',
 	// deprecated apis
 	't.ok(value, [message])',
 	't.notOk(value, [message])',

readme.md

@@ -878,6 +878,10 @@ Assert that `function` doesn't throw an `error` or `promise` resolves.
 
 Assert that `contents` matches `regex`.
 
+### `.notRegex(contents, regex, [message])`
+
+Assert that `contents` does not match `regex`.
+
 ### `.ifError(error, [message])`
 
 Assert that `error` is falsy.

test/assert.js

@@ -345,6 +345,18 @@ test('.regex()', function (t) {
 	t.end();
 });
 
+test('.notRegex()', function (t) {
+	t.doesNotThrow(function () {
+		assert.notRegex('abc', /def/);
+	});
+
+	t.throws(function () {
+		assert.notRegex('abc', /abc/);
+	});
+
+	t.end();
+});
+
 test('.ifError()', function (t) {
 	t.throws(function () {
 		assert.ifError(new Error());