Adds new documentation for PostCode validator

[froschdesign]

Q	A
Documentation	yes

[michalbundyra]

As I have checked in the code it is true when we skip delimiters, completely, but if we use other delimiters than / it will break the regexp by attaching additional /^ and $/. We can provide regexp as: #^AT-\d{3}$# but internally it will be broken and changed to: /^#^AT-\d{3}$#$/

[froschdesign]

The question that arises here: is the documentation wrong or the code which handles this behaviour?
In my opinion the simple handling should be in the foreground and the code should realize this.

[michalbundyra]

I would prefer to detect any delimiter used, but the question is if we can do that in any reliable way?
Hm... I would need to think about it.

In general I do not like idea of attaching /^ and $/ (maybe / is the most used, but is not the only/valid one and there are sometimes good reasons to use another).

[froschdesign]

If we have a problem here then a separate issue report is needed.

[michalbundyra]

@froschdesign I've created issue: #18

[michalbundyra]

Thanks, @froschdesign!