fix(input): escape forward slash in email regexp

This messed up with syntax coloring and variable hovering in chrome developer tools and made debugging really difficult.

Closes #8096
docs($anchorScroll): update example to use a module
docs($compile): update example to use a module
docs(formDirective): update example to use a module
docs(ngModel): update examples to use modules
docs(ngChange): update example to use a module
docs($document): update example to use a module
docs($http): update example to use a module
docs(ngBind): update examples to use modules
docs(ngSubmit): update example to use a module
docs($window): update example to use a module
docs(ngController): update examples to use modules
docs(filters): update examples to use modules
docs($interval): update example to use a module
docs(ngInclude): update example to use a module
docs(ngList): update example to use a module
docs(ngValue): update example to use a module
docs(ngModelOptions): update examples to use modules
docs(ngInit): update example to use a module
docs(ngSwitch): update example to use a module