Contact form 7 Form's field validation

// Validate CF7 text field for name
function custom_name_field_validation_filter($result, $tag) {  
	$type = $tag['type'];  
	$name = $tag['name'];
	//here textbox type name is 'subject'
	if($name == 'first-name' || $name == 'last-name') { 
		$value = $_POST[$name];  
		if (preg_match('/[\^£$%*()}{#~><>|=_+¬]/', $value)){
		  $result->invalidate( $tag, "Invalid characters." );
		} 
	} 
	return $result;  
}
add_filter('wpcf7_validate_text','custom_name_field_validation_filter', 10, 2); 
add_filter('wpcf7_validate_text*', 'custom_name_field_validation_filter', 10, 2); 

// Validate CF7 text field
function custom_text_validation_filter($result, $tag) {  
	$type = $tag['type'];  
	$name = $tag['name'];
	//here textbox type name is 'subject'
	if($name == 'city' || $name == 'state' || $name == 'zip') { 
		$value = $_POST[$name];  
		if (preg_match('/[\'^£$%&*()}{@#~><>|=_+¬]/', $value)){
		  $result->invalidate( $tag, "Invalid characters." );
		} 
	} 
	return $result;  
}
add_filter('wpcf7_validate_text','custom_text_validation_filter', 10, 2); 
add_filter('wpcf7_validate_text*', 'custom_text_validation_filter', 10, 2); 

// Validate CF7 textarea
function custom_textarea_validation_filter($result, $tag) {  
	$type = $tag['type'];  
	$name = $tag['name'];
	if($name == 'message' || $name == 'address') { 
		$value = $_POST[$name];  
		if (preg_match('/[\'^£$%&*()}{@#~><>|=_+¬]/', $value)){
		  $result->invalidate( $tag, "Invalid characters." );
		} 
	}
	return $result;  
}
// add_filter('wpcf7_validate_textarea','custom_textarea_validation_filter', 10, 2); 
// add_filter('wpcf7_validate_textarea*', 'custom_textarea_validation_filter', 10, 2);