title: Webpack loader test for files without certain part of filename
body: <p>I keep my tests in the same folder as my components, and I'm trying to apply a webpack loader (<code>istanbul-instrumenter-loader</code>) to all files except the ones called exactly <code>spec.js</code> or that end with <code>*Spec.js</code> (so both <code>components/SupportPage/spec.js</code> and <code>actions/SupportActionsSpec.js</code> won't get included. I've tried getting a correct RegEx on regextester.com but I can't get it to work. Am I missing something?</p>