src/Blocks/Inline/BlockStrong.php
protected function convertStars($lineContent)
    {
        return preg_replace_callback('/([\*]{2}\S)(.*)(\S?[\*]{2})/U', function ($found) {
            return $this->getStartTag() . str_replace(static::DOUBLE_ASTERISKS, '', $found[0]) . $this->getEndTag();
        }, $lineContent);
    }
protected function convertStars($lineContent)
    {
        return preg_replace_callback('/([\*]{2}\S)(.*)(\S?[\*]{2})/U', function ($found) {
            return $this->getStartTag() . str_replace(static::DOUBLE_ASTERISKS, '', $found[0]) . $this->getEndTag();
        }, $lineContent);
    }
@param string $lineContent

@return string