Question

I need a regex that checks if a string only contain letters(a-z) and that the first letter is uppercase, you cant have 2 letters in a word uppercase Like: THomas or THomAS but Thomas Anderson (Thomas anderson too) would be valid

look:

The Magician Of The Elfs would be valid but not ThE MaGiCiAN oF ThE ELFS

if (!preg_match("??", $name)) {
   echo "Invalid name!";
}

hope you understand!

Tomasz

Invalid:

MaGIciaN Of The ELFz
THomas anderson

Valid:

Magician of the elfs
Magician Of the Elfs
Magician of The elfs
Thomas Anderson
Thomas anderson

Basically i dont want it to be possible to have more than 1 capitalized letter in a word, not sentence.

Answer 1

You can also describe the character by its Unicode character properties:

/^\p{Lu}\p{Ll}*(?:\s+\p{Lu}\p{Ll}*)*$/

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Edit    Since you changed your requirements, try this regular expression:

/^[\p{Lu}\p{Ll}]\p{Ll}*(?:\s+[\p{Lu}\p{Ll}]\p{Ll}*)*$/

Now the first character or each word can be an uppercase letter or a lowercase letter.