private function buildInlineParserCharacterRegex()
{
$chars = array_keys($this->inlineParsersByCharacter);
if (empty($chars)) {
// If no special inline characters exist then parse the whole line
$this->inlineParserCharacterRegex = '/^.+$/u';
} else {
// Match any character which inline parsers are not interested in
$this->inlineParserCharacterRegex = '/^[^' . preg_quote(implode('', $chars)) . ']+/u';
}
}