Regular expression for matching a shebang
$ npm install --save shebang-regex
```js var shebangRegex = require('shebang-regex'); var str = '#!/usr/bin/env node\nconsole.log("unicorns");';
shebangRegex.test(str); //=> true
shebangRegex.exec(str)[0]; //=> '#!/usr/bin/env node' ```
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