Tribe__Validate::city_or_province()
validates a field as being a city or province allows for letters, dashes and spaces only
Source
File: src/Tribe/Validate.php
public function city_or_province() {
$this->value = stripslashes( $this->value );
if ( preg_match( "/^[\D '\-]+$/", $this->value ) ) {
$this->result->valid = true;
} else {
$this->result->valid = false;
$this->result->error = sprintf( esc_html__( '%s must consist of letters, spaces, apostrophes, and dashes.', 'tribe-common' ), $this->label );
}
}