URL regex matches surrounding quotes

[alondahari]

The build in regex matcher for urls includes surrounding quotes, which can be destructive if we feed serialised objects to the redactor. A slightly improved regex might be: /(https?:\/\/)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)/g,