Regular expression for first and last name

Question

For website validation purposes, I need first name and last name validation.

For the first name, it should only contain letters, can be several words with spaces, an

Answer 1

Try these solutions, for maximum compatibility, as I have already posted here:

JavaScript:

var nm_re = /^(?:((([^0-9_!¡?÷?¿/\\+=@#$%ˆ&*(){}|~<>;:[\]'’,\-.\s])){1,}(['’,\-\.]){0,1}){2,}(([^0-9_!¡?÷?¿/\\+=@#$%ˆ&*(){}|~<>;:[\]'’,\-. ]))*(([ ]+){0,1}(((([^0-9_!¡?÷?¿/\\+=@#$%ˆ&*(){}|~<>;:[\]'’,\-\.\s])){1,})(['’\-,\.]){0,1}){2,}((([^0-9_!¡?÷?¿/\\+=@#$%ˆ&*(){}|~<>;:[\]'’,\-\.\s])){2,})?)*)$/;

HTML5: