re_replace not including backreferences in replaced string

@tubedogg wrote:

I have the following included in a notification template:

{{entry.title|re_replace('(.*?)\s\-\sS(\d{2,4})E(\d{2,3})\s\[.*','\1 - s\2e\3')}}

Example title:

Arrow - S05E17 [ 2017 ] [ MKV | H.264 | WEBRip | 720p | FastTorrent ] [ Uploader: Anonymous ]  [ Arrow.S05E17.Kapiushon.720p.AMZN.WEBRip.DD5.1.x264 ]

{{entry.title}}, without any filters on it, returns the full title. Once I apply the above filter, the result is the following string every time:

 - se

(i.e. the replacement string without the backreferences.)

I know the regex is correct for multiple reasons. For one, I tested it in an online Python regex checker. For two, if I remove .* at the end of the regex, the resulting title is this:

 - se 2017 ] [ MKV | H.264 | WEBRip | 720p | FastTorrent ] [ Uploader: Anonymous ]  [ Arrow.S05E17.Kapiushon.720p.AMZN.WEBRip.DD5.1.x264-CasStudio ]

Meaning, it is correctly matching Arrow - S05E17 [ and trying to replace it with the replacement string. But the backreferences in the replacement string aren't replaced.

I thought maybe it had something to do with the whole template thing, so I tried using set to create a field called fixed_title from the title:

    set:
      fixed_title: '{{title|re_replace("(.*?)\s\-\sS(\d{2,4})E(\d{2,3})\s\[.*","\1 - s\2e\3")}}'

and then call {{show_title}} in the template. That resulted in the same thing as above.

What am I doing wrong?

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