chore: Don't validate example value with regex

[tienvx]

• Follow suggestion from @mefellows : the value must be correct type, no need to validate beforehand
• This change allows the use of an empty string ('') instead of null as an example value when a generator is set. This way, we don't need to find a value that matches the regex, since the generator will replace that value later anyway.

[coveralls]

Pull Request Test Coverage Report for Build 12130655028

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.009%) to 96.291%

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Totals
Change from base Build 12130132873:	-0.009%
Covered Lines:	2570
Relevant Lines:	2669

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💛 - Coveralls