RegEx to enforce a typical Forename format

Question

I would like to develop a RegEx that can enforce a typical Forename format that enforces the below:

• First character must be uppercase letter.
• Last character must be lowercase letter.
• Only letters, apostrophe, fullstop, hyphen and space are allowed.
• Consecutive punctuation is not allowed.

For example the following names would be fine: [John, Jean-Pierre, Smith.Rowe, Harry Smith]

But the following names would not be allowed [john, Jean--Pierre, Smith.-Rowe, Harry Smith (two spaces between names)]

Can anyone assist?

Answer 1

Below regex may help.
Lower case, upper case matches can be matched with [A-Z] and [a-b].
Consecutive punctuations, can be matched with lookaround assertions.

^[A-Z](?:[a-zA-Z]|(?:(?<![ .'-])[ .'-](?![ .'-])))*[a-z]$

Demo