`[0]` will throw an exception with RegexParser

[rhukster]

We have a page that has some JS pasted in it.. part of that JS has the string [0] and this throws the error:

InvalidArgumentException Shortcode name must be a non-empty string!

Test code:

[0] something

FYI WordpressParser works fine.

[thunderer]

Wordpress' parser regex allows only characters in shortcode name, it does not catch shortcodes which have numbers in name. As for the rest of the parsers, there is a bug in Shortcode class constructor which checks if name is not empty() and '0' is triggering type coercion to integer 0. I fixed that in the latest commit on master 0797f66 .

[rhukster]

Confirmed fixed.. Thanks!