xml schema regex - how to select capital letter followed by all lowercase

Question

So I have to following XML elements:

<branch>
    <branchName>Emperor</branchName>
</branch>

and

<branch>
    <branchName>Perception<branchName>
</branch>

.. and so on, all of which start with a capital letter and the rest is lowercase. I tried to use Regex to capture this however this is my first time using it an I just throw together the following:

"[A-Z](([a-z])*)"

When I tried to validate my schema using the validator it did not work, I got an error saying:

ERROR - cvc-pattern-valid: Value 'Emperor' is not facet-valid with respect to pattern '[A-Z](([a-z])*)' for type '#AnonType_branchNamebranchbranches'.
ERROR - cvc-type.3.1.3: The value 'Emperor' of element 'branchName' is not valid.
ERROR - cvc-pattern-valid: Value 'Perception' is not facet-valid with respect to pattern '[A-Z](([a-z])*)' for type '#AnonType_branchNamebranchbranches'.
ERROR - cvc-type.3.1.3: The value 'Perception' of element 'branchName' is not valid.

Essentially I looked at w3schools version of how to restrict data. After that I looked around for a tutorial for regular expressions but none show how to combine expressions, they just show how you write individual parts.

1) My question is how do I show this using a regular expression? (An uppercase followed by n number of lower cases)

2) could you direct me to a good tutorial that shows from start to end how to create a regular expression for xml

(An answer to 1 is appreciated but only if 2 is also answered. I do want to learn this for myself)

edit 31/03/2016 @ 01:38: Changed the question in order to make what I was asking more clear.

Answer 1

1) My question is how do I show this using a regular expression? (An uppercase followed by n number of lower cases)

Using regex like this.

Regex: ^[AZ][az]+ . If you use * instead of + it will also match is there are zero lower case letters.

Regex101 Demo

Answer 2

您可以尝试使用 out ^ 它将匹配 aBc 也作为正确的字符串。

^[A-Z][a-z]+