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Extract release group from trailing (...) metadata

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Amazon/streaming rips like:
  Helluva Boss (2020) - S01E01 - Murder Family (1080p AMZN WEB-DL x265 Celdra)
tuck the release group in as the last word of the closing metadata
block instead of a "-Group" suffix or its own brackets. That trailing
word is now promoted to a [Group] prefix and stripped from the
parentheses, e.g.:
  [Celdra] Helluva Boss (2020) - S01E01 - Murder Family (1080p AMZN WEB-DL x265)

Only fires when the rest of the block already looks like quality
metadata (resolution/source/codec/etc.), so unrelated parentheticals
like "(2020)" or "(Dual Audio)" are left untouched.
This commit is contained in:
l4kr
2026-07-08 10:59:21 +02:00
parent 10d7c14444
commit 3efe246a20
2 changed files with 40 additions and 5 deletions
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Services/FileNameHelper.cs
+38 -3
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@@ -20,6 +20,13 @@ public static class FileNameHelper
private static readonly Regex FileSuffixTagRegex =
new(@"-([A-Za-z][A-Za-z0-9]{2,20})$", RegexOptions.Compiled);
// Trailing parenthesised metadata block ending in the release group as its
// last word, e.g. "... (1080p AMZN WEB-DL x265 Celdra)" → group="Celdra".
// Common on Amazon/streaming rips that don't set the group off with a
// "-" or its own brackets.
private static readonly Regex TrailingParenGroupRegex =
new(@"\(([^()]*)\)$", RegexOptions.Compiled);
// Prefix release tag: "[KAA] Show Name" → tag = "KAA"
private static readonly Regex PrefixTagRegex =
new(@"^\[(.+?)\]", RegexOptions.Compiled);
@@ -45,7 +52,8 @@ public static class FileNameHelper
new(@"^(BD|BluRay|Blu-Ray|WEB|WEB-DL|WEBRip|HDTV|AMZN|NF|DSNP|HULU|MAX)$",RegexOptions.IgnoreCase | RegexOptions.Compiled), // sources
new(@"^(Remux|Encode)$", RegexOptions.IgnoreCase | RegexOptions.Compiled), // processing
new(@"^(HEVC|AVC|x264|x265|H\.?264|H\.?265|VP9)$", RegexOptions.IgnoreCase | RegexOptions.Compiled), // video codecs
new(@"^(FLAC|AAC|DTS|TrueHD|Atmos|AC3|EAC3|Opus|MP3)$", RegexOptions.IgnoreCase | RegexOptions.Compiled), // audio codecs
new(@"^(FLAC|AAC|DTS(-HD)?|TrueHD|Atmos|E?AC3|DDP?|Opus|MP3)(\d(\.\d)?)?$", RegexOptions.IgnoreCase | RegexOptions.Compiled), // audio codecs (+ optional channel suffix, e.g. DDP5.1)
new(@"^\d\.\d$", RegexOptions.Compiled), // bare channel count, e.g. 5.1
new(@"^(HDR|SDR|10bit|8bit|HDR10|DV|DoVi)$", RegexOptions.IgnoreCase | RegexOptions.Compiled), // HDR / bit-depth
];
@@ -56,8 +64,10 @@ public static class FileNameHelper
/// (in order):
/// <list type="number">
/// <item>Filename suffix tag extraction — a trailing <c>-GroupName</c> on
/// the filename stem is stripped and promoted to a bracket prefix.
/// Takes priority over any folder-derived tag.</item>
/// the filename stem, or a release group tucked in as the last word
/// of a trailing <c>(...)</c> metadata block (e.g. Amazon rips like
/// <c>(1080p AMZN WEB-DL x265 Celdra)</c>), is stripped and promoted
/// to a bracket prefix. Takes priority over any folder-derived tag.</item>
/// <item>Show-name injection — if the (now tag-free) filename starts with
/// an episode code (e.g. S01E01) the show name is derived from the
/// parent folder and prepended.</item>
@@ -85,6 +95,31 @@ public static class FileNameHelper
stemNoExt = stemNoExt[..fileSuffixMatch.Index];
fileName = stemNoExt + ext;
}
else
{
// 1b. Extract a release group tucked in as the last word of a
// trailing "(...)" metadata block, e.g.
// "... (1080p AMZN WEB-DL x265 Celdra)" → tag="Celdra",
// stem="... (1080p AMZN WEB-DL x265)".
var parenMatch = TrailingParenGroupRegex.Match(stemNoExt);
if (parenMatch.Success)
{
string parenContent = parenMatch.Groups[1].Value;
var words = parenContent.Split(' ', StringSplitOptions.RemoveEmptyEntries);
// Only treat the last word as a release group if the rest of the
// block is recognisable quality/source/codec metadata — this
// avoids misfiring on unrelated parentheticals like "(2020)" or
// "(Dual Audio)" that don't carry a group name.
if (words.Length >= 2 && !IsMetadataToken(words[^1]) && words[..^1].Any(IsMetadataToken))
{
fileTag = words[^1];
string remaining = string.Join(" ", words[..^1]);
string beforeParen = stemNoExt[..parenMatch.Index].TrimEnd();
stemNoExt = string.IsNullOrEmpty(remaining) ? beforeParen : $"{beforeParen} ({remaining})";
fileName = stemNoExt + ext;
}
}
}
// 2. Determine the release tag: filename suffix > folder tag.
string? tag = fileTag;