diff --git a/.gitignore b/.gitignore
index 5538cb11cd25..e0e4665a3698 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,8 +2,6 @@
 .eslintcache
 *.swp
 *~
-.idea
-*.iml
 /examples/*/node_modules/
 /integration_tests/*/node_modules
 /integration_tests/transform/*/coverage
diff --git a/integration_tests/__tests__/config-test.js b/integration_tests/__tests__/config-test.js
index ddbf852542c9..405d64c005b7 100644
--- a/integration_tests/__tests__/config-test.js
+++ b/integration_tests/__tests__/config-test.js
@@ -18,7 +18,7 @@ test('config as JSON', () => {
   const result = runJest('verbose_reporter', [
     '--config=' + JSON.stringify({
       testEnvironment: 'node',
-      testRegex: 'banana strawbery kiwi',
+      testGlob: ['banana strawbery kiwi'],
     }),
   ]);
   const stdout = result.stdout.toString();
diff --git a/packages/jest-cli/src/SearchSource.js b/packages/jest-cli/src/SearchSource.js
index 4c851d7094a6..0f6d6f812ee3 100644
--- a/packages/jest-cli/src/SearchSource.js
+++ b/packages/jest-cli/src/SearchSource.js
@@ -15,7 +15,7 @@ import type {HasteContext} from 'types/HasteMap';
 import type {Glob, Path} from 'types/Config';
 import type {ResolveModuleConfig} from 'jest-resolve';
 
-const mm = require('micromatch');
+const micromatch = require('micromatch');
 
 const DependencyResolver = require('jest-resolve-dependencies');
 
@@ -78,13 +78,13 @@ const globsToMatcher = (globs: ?Array<Glob>) => {
     return () => true;
   }
 
-  const matchers = globs.map(each => mm.matcher(each));
+  const matchers = globs.map(each => micromatch.matcher(each));
 
   return (path: Path) => matchers.some(each => each(path));
 };
 
 const regexToMatcher = (testRegex: string) => {
-  if (!testRegex.length) {
+  if (!testRegex) {
     return () => true;
   }
 
diff --git a/packages/jest-cli/src/__tests__/SearchSource-test.js b/packages/jest-cli/src/__tests__/SearchSource-test.js
index f1fa2bfdddc9..fdfcb7ed1a00 100644
--- a/packages/jest-cli/src/__tests__/SearchSource-test.js
+++ b/packages/jest-cli/src/__tests__/SearchSource-test.js
@@ -59,7 +59,7 @@ describe('SearchSource', () => {
         config = normalizeConfig({
           name,
           rootDir: '.',
-          testGlob: [],
+          testGlob: null,
           testPathDirs: [],
           testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.jsx?$',
         });
@@ -100,7 +100,7 @@ describe('SearchSource', () => {
         moduleFileExtensions: ['js', 'jsx', 'txt'],
         name,
         rootDir,
-        testGlob: [],
+        testGlob: null,
         testRegex: 'not-really-a-test',
       });
       return findMatchingTests(config).then(data => {
@@ -136,7 +136,7 @@ describe('SearchSource', () => {
         moduleFileExtensions: ['js', 'jsx'],
         name,
         rootDir,
-        testGlob: [],
+        testGlob: null,
         testRegex: 'test\.jsx?',
       });
       return findMatchingTests(config).then(data => {
@@ -173,7 +173,7 @@ describe('SearchSource', () => {
       const config = normalizeConfig({
         name,
         rootDir,
-        testGlob: [],
+        testGlob: null,
         testRegex,
       });
       return findMatchingTests(config).then(data => {
@@ -261,7 +261,7 @@ describe('SearchSource', () => {
       const config = normalizeConfig({
         name,
         rootDir,
-        testGlob: [],
+        testGlob: null,
         testRegex,
       });
       return findMatchingTests(config).then(data => {
diff --git a/packages/jest-config/src/normalize.js b/packages/jest-config/src/normalize.js
index 727ab5d6ab0b..8d0b25671b58 100644
--- a/packages/jest-config/src/normalize.js
+++ b/packages/jest-config/src/normalize.js
@@ -319,11 +319,6 @@ function normalize(config: InitialConfig, argv: Object = {}) {
       case 'unmockedModulePathPatterns':
         value = normalizeUnmockedModulePathPatterns(config, key);
         break;
-
-      case 'testRegex':
-        value = config[key];
-        break;
-
       case 'automock':
       case 'bail':
       case 'browser':
@@ -352,6 +347,7 @@ function normalize(config: InitialConfig, argv: Object = {}) {
       case 'rootDir':
       case 'testGlob':
       case 'testEnvironment':
+      case 'testRegex':
       case 'testReporter':
       case 'testRunner':
       case 'testURL':
@@ -376,8 +372,9 @@ function normalize(config: InitialConfig, argv: Object = {}) {
     }
   }
 
-  if (config.testRegex && (!config.testGlob || config.testGlob.length === 0)) {
-    // Prevent default glob conflicting with any explicit `testRegex` value
+  if (config.testRegex && (!config.testGlob)) {
+    // Prevent the default testGlob conflicting with any explicitly
+    // configured `testRegex` value
     newConfig.testGlob = [];
   }
 
diff --git a/packages/jest-editor-support/src/Settings.js b/packages/jest-editor-support/src/Settings.js
index ae5b8db50f09..584cbe0278dd 100644
--- a/packages/jest-editor-support/src/Settings.js
+++ b/packages/jest-editor-support/src/Settings.js
@@ -30,7 +30,6 @@ const {jestChildProcessWithArgs} = require('./Process');
 type Glob = string;
 
 type ConfigRepresentation = {
-  testRegex: string,
   testGlob: Array<Glob>
 }
 
@@ -51,7 +50,6 @@ module.exports = class Settings extends EventEmitter {
         '**/__tests__/**/*.js?(x)',
         '**/?(*.)(spec|test).js?(x)',
       ],
-      testRegex: '(/__tests__/.*|\\.(test|spec))\\.jsx?$',
     };
   }
 
diff --git a/packages/jest-runtime/src/shouldInstrument.js b/packages/jest-runtime/src/shouldInstrument.js
index 1380de8cdf1d..ecd98e1b4321 100644
--- a/packages/jest-runtime/src/shouldInstrument.js
+++ b/packages/jest-runtime/src/shouldInstrument.js
@@ -23,8 +23,10 @@ const shouldInstrument = (filename: Path, config: Config): boolean => {
     return false;
   }
 
-  if (config.testGlob && config.testGlob.length
-    && micromatch.any(filename, config.testGlob)) {
+  if (
+    config.testGlob &&
+    config.testGlob.length &&
+    micromatch.any(filename, config.testGlob)) {
     return false;
   }
 
diff --git a/packages/jest-util/src/messages.js b/packages/jest-util/src/messages.js
index a7b9fe9d3e9c..56676efeda70 100644
--- a/packages/jest-util/src/messages.js
+++ b/packages/jest-util/src/messages.js
@@ -13,7 +13,7 @@ import type {Config, Glob, Path} from 'types/Config';
 import type {AssertionResult, TestResult} from 'types/TestResult';
 
 const chalk = require('chalk');
-const mm = require('micromatch');
+const micromatch = require('micromatch');
 const path = require('path');
 const separateMessageFromStack = require('./separateMessageFromStack');
 
@@ -121,7 +121,7 @@ const formatPaths = (
   // highlight paths from the current test file
   if (
     (config.testGlob && config.testGlob.length
-      && mm(filePath, config.testGlob)) ||
+      && micromatch(filePath, config.testGlob)) ||
     filePath === relativeTestPath
   ) {
     filePath = chalk.reset.cyan(filePath);