Problem with regexs and arrays

[JoJolM]

I was wondering if someone could help me understand this line of code

self.lang_config[lang][x][str(i)]['re'] = (
                        re.compile(self.lang_config[lang][x][str(i)]['match']

[Gribouillis]

It is not a line of code. There are unmatched parentheses.