HB Caching Exclusions adds extra backslashes

Description: In exclusion field for page caching, it adds backslashes before every dot (.). Even on save, the default exclusion "wp-.*\.php" is converted to "wp-\.*\.php"

Here is the screenshot: https://static.livechatinc.com/8801096/P433TH9F97/c451417fb2c4b4fe1f34fa85046d958a/Schermafdruk%20van%202018-02-13%2016-27-18.png