src/VerbalExpressions.php
public function _or($value) {
        if (strpos($this->prefixes, "(") === false) {
            $this->prefixes .= "(?:";
        }
        if (strpos($this->suffixes, ")") === false) {
            $this->suffixes .= ")";
        }
        $this->add(")|(?:");
        if ($value) {
            $this->add($value);
        }
        return $this;
    }
public function _or($value) {
        if (strpos($this->prefixes, "(") === false) {
            $this->prefixes .= "(?:";
        }
        if (strpos($this->suffixes, ")") === false) {
            $this->suffixes .= ")";
        }
        $this->add(")|(?:");
        if ($value) {
            $this->add($value);
        }
        return $this;
    }
OR

Wraps the current expression in an `or` with $value
Notice: OR is a reserved keyword in PHP, so this method is prefixed with "_"

@access public
@param  string $value new expression
@return VerbalExpressions