Which is proper grammar, should there be a coma or not?

Question

He would have said “No” regardless of the question.

He would have said, “No” regardless of the question.

Answer 1

Neither is correct.

This is the correct way to punctuate your sentence...(and I use commas, not comas...)

He would have said, "No," regardless of the question.

Answer 2

While there are many specific uses for commas, nearly eighty-five percent of the commas used in written English are used in a mere three situations.

If you know the basic rule for these three cases, you can use commas in over four-fifths of the times you need to use commas.

Put a comma before a coordinating conjunction that separates two independent clauses.
"We washed the dog, and then we cleaned up the mess that he made".
(This contains two independent clauses with their own subject and verb: We washed and we cleaned. The third clause, that he made, is a subordinate clause, so the rule does not apply.)

Put a comma after introductory words, phrases, or clauses in a sentence.
"Please, Robert, hand the gentleman some mustard."

Use commas to set off elements that interrupt or add information in a sentence.
"John headed this way; however, he did not see me."
(Conjunctive Adverbs are adverbs which join sentence parts. The following words are the most common conjunctive adverbs:
also, besides, furthermore, however, indeed, instead, moreover, nevertheless, otherwise, therefore, thus )

Your sentence would fit under the third rule, therefore it would read as follows;
"He would have said, "No", regardless of the question.

Punctuation marks always go outside the quotation mark in English. :-)

Answer 3

Always separate a quote within a sentence by placing a comma before and after the quote.
The sentence should be written: He would have said, "No", regardless of the question.
Make sure to place the second comma outside of the quotation marks.

Answer 4

He would have said "no" regardless of the question.

That's the correct form. No comma, no capitalized "n."

Answer 5

No coma.