Tribe__Validate::zip()
validates a field as being a zip code
Source
File: src/Tribe/Validate.php
public function zip() {
if ( preg_match( '/^[0-9]{5}$/', $this->value ) ) {
$this->result->valid = true;
} else {
$this->result->valid = false;
$this->result->error = sprintf( esc_html__( '%s must consist of 5 numbers.', 'tribe-common' ), $this->label );
}
}