src/Host.php
protected function _compile()
    {
        if ($this->pattern() === '*') {
            return;
        }
        $parser = $this->_classes['parser'];
        $rule = $parser::compile($this->token());
        $this->_regex = $rule[0];
        $this->_variables = $rule[1];
    }
protected function _compile()
    {
        if ($this->pattern() === '*') {
            return;
        }
        $parser = $this->_classes['parser'];
        $rule = $parser::compile($this->token());
        $this->_regex = $rule[0];
        $this->_variables = $rule[1];
    }
Compiles the host's patten.