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Add below code in functions.php file for Validation of Phone number (10 Digits only)
Step 1: Go to your CF7 (Contact form 7) Plugin and add tel tag
Step 2: After assigning tel tag add below code in functions.php file
Step 3: Fill the form and check once, it should display Validation error for Telephone field
Note: This is applicable for all the Contact form 7 Versions.
// define the wpcf7_is_tel callback
function custom_filter_wpcf7_is_tel( $result, $tel ) {
$result = preg_match( '/^\(?\+?([0-9]{1,4})?\)?[-\. ]?(\d{10})$/', $tel );
return $result;
}
add_filter( 'wpcf7_is_tel', 'custom_filter_wpcf7_is_tel', 10, 2 );