Reg_exp examples /preg_match / regexp

PHP: Reg_exp examples | preg_match | regexp

// clean phone number for link "tel:1234567"
preg_replace("#(?<=\d)[\s-]+(?=\d)#","", $number)

// phone number
preg_match('/^\+[0-9\-\s]*(\([0-9]+\))?[0-9\-\s]*$/', $number)

// email
preg_match("/[0-9a-z]+@[a-z.]/", $email)

// phone number with WP ACF
<?php if (preg_match('/^[0-9\-\s]*(\([0-9]+\))?[0-9\-\s]*$/', $phone)): ?>
	<span><a href="tel:<?php echo preg_replace('/\s+/', '', $phone); ?>"><?php echo $phone; ?></a></span>
<?php else: ?>
	<span><?php echo $phone; ?></span>
<?php endif ?>