[createGenerateClassName] Request to add forward slash to "escapeRegex"

[huisenwu]

The following code block does not work in IE11 because IE11 failed to parse class name with forward slash.

const styles = {
    root: {
        backgroundColor: "red"
    }
};

@withStyles(styles, {name: "foo/bar"})
class MyComponent extends React.Component {
    render () {
        return <div className={this.props.classes.root}>Hello World!</div>;
    }
}

export default MyComponent;

Under non-production environment, withStyles adds name option or React component's displayName as the prefix to class names. If the name option or React component's displayName contains forward slash, the classes do not work in IE11.

So request to add forward slash to regular expression escapeRegex in createGenerateClassName.

[oliviertassinari]

I'm closing for https://github.com/cssinjs/jss/issues/870