Method process

/**
 * Process a string.
 *
 * @param   string  $string  The string to process.
 *
 * @return  string
 *
 * @since   4.0.0
 */
public function process($string)
{
    preg_match_all($this->tagFilter, $string, $matches);
    if (!$matches) {
        return $string;
    }
    foreach ($matches[0] as $i => $m) {
        if (\array_key_exists($matches[1][$i], $this->styles)) {
            $string = $this->replaceColors($string, $matches[1][$i], $matches[2][$i], $this->styles[$matches[1][$i]]);
        } elseif (strpos($matches[1][$i], '=')) {
            $string = $this->replaceColors($string, $matches[1][$i], $matches[2][$i], ColorStyle::fromString($matches[1][$i]));
        }
    }
    return $string;
}