I wanted a simple regex phone validation for WordPress plugin Contact Form 7.  The validation had to be in the form of xxx-xxx-xxxx. I ran across a blog page by Eric Holmes.  He was learning regex at the time, but did a superb job.  The link is: http://ericholmes.ca/form-validation-in-php-simplified/ He has since updated his original post at: http://ericholmes.ca/php-phone-number-validation-revisited/ So, in the …