[bug] Fix spanish vat regex, which previously allowed invalid vat ending overflow

[Swop]

Since the Spanish VAT pattern allows multiple combinaisons (with the regex pipe "|"), it looks like the regex accept any string if only the beginning of the string is matching any of the possible patterns.

This means that the validator will consider those examples as valid:

• ESB1234567C
• ES12345678D
• ESE12345678

but also those ones:

• ESB1234567C_insert_here_anything
• ES12345678D_the_end_will_never_be_checked
• ESE12345678_wink_wink

Here's a patch to avoid this problem.

[dannyvankooten]

Awesome @Swop, thank you for catching it! Merged and released in 2.0.2 of the package.

[Swop]

Cool. Thanks!