[5.3] Fix validating distinct for nested keys

[themsaid]

We currently use Str::is($attributeName, $key) to see if the given key matches the pattern we use to check for distinct values which is foo.*.bar, the problem is that foo.*.bar matches foo.1.nested.bar which shouldn't be matched, so in this PR I use regex instead of the is() helper.

I replace * in the pattern with [^.]+ to match any character by the dot.

[jhayiwg]

Hello,

Im still new with laravel and Im having problem using the validation I have a repeater fields that should validate 3 unique fields
example:
should be true if [ [ a => 1, b=>2, c=>3 ], [ a => 1, b=>2, c=>4 ]]
it should be failed if [ [ a => 1, b=>2, c=>3 ], [ a => 1, b=>2, c=>3 ]]

Base from what I see from the test it is only checking 1 field is there any way to validate somethink like this

Validator($trans, [ [ a => 1, b=>2, c=>3 ], [ a => 1, b=>2, c=>3 ]], ['foo.*.[a,b,c]' => 'distinct']);

I`m also using laravel 3

Many thanks