fix(parser/regex): handle optional 'a' after ddp for audio channel patterns

[Nuclei8234]

Issue: Audio channel patterns were not matching ddpa5.1 formats
Root Cause: The regex pattern for audio channels didn't account for the optional 'a' in ddpa (Dolby Digital Plus Atmos) formats
Solution: Updated 5.1, 6.1, and 7.1 audio channel patterns to include ((p(lus)?|+)a?)? instead of (p(lus)?|+)? to support the optional 'a' suffix

Summary by CodeRabbit

Bug Fixes

• Enhanced detection of 5.1, 6.1, and 7.1 Dolby Digital and Digital+ audio channel configurations for improved accuracy in media parsing and recognition.

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[coderabbitai]

Walkthrough

Updated audio channel regex patterns in the parser to allow an optional 'a' character following the plus indicator in Dolby Digital+ (5.1, 6.1, and 7.1) sequences. The modification expands the pattern from (p(lus)?|\+)? to (p(lus)?|\+)a? within the audioChannels object, broadening pattern matching without altering the public API surface.

Changes

Cohort / File(s)	Summary
Audio Channel Regex Pattern Updates packages/core/src/parser/regex.ts	Modified audioChannels patterns for 5.1, 6.1, and 7.1 Dolby Digital+ sequences to accept an optional 'a' character immediately following the plus/plus-like indicator (e.g., "ddpa"), broadening supported audio format variations.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• fix(parser/regex): fix Atmos/DD+ audio tags #561: Updates audioTags patterns with the same optional 'a' character addition after the plus indicator for Dolby Digital+.
• fix: improve regex parser #419: Extends DD+ regex coverage in audioTags to include additional audio format variations.

Suggested reviewers

• Viren070

Poem

🐰✨ A pattern perfected, so subtle and neat,
Where 'a' finds its home in the Dolby beat,
Five point one, six point one, seven as well,
Regex rejoices—what stories they'll tell! 🎵

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding support for an optional 'a' after ddp in audio channel regex patterns, which directly addresses the issue of matching ddpa5.1 formats.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

• 📝 Generate docstrings

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📜 Recent review details

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between de956de and b53787e.

📒 Files selected for processing (1)

• packages/core/src/parser/regex.ts

🧰 Additional context used

🧠 Learnings (1)

📚 Learning: 2025-09-14T16:46:18.507Z

Learnt from: DavidGracias
Repo: Viren070/AIOStreams PR: 375
File: packages/core/src/formatters/base.ts:0-0
Timestamp: 2025-09-14T16:46:18.507Z
Learning: In packages/core/src/formatters/base.ts, the modifier definitions intentionally include regex patterns (like "join('.*?')", "$.*?", "^.*?") that require pattern matching functionality. The buildModifierRegexPattern() method should not fully escape all regex metacharacters as this would break the intended regex matching behavior within modifier definitions.

Applied to files:

• packages/core/src/parser/regex.ts

🔇 Additional comments (1)

packages/core/src/parser/regex.ts (1)

115-123: The regex pattern changes correctly support Dolby Digital Plus Atmos variants.

All three audio channel patterns (5.1, 6.1, 7.1) have been updated with the optional 'a' suffix — changing ((p(lus)?|\+))? to ((p(lus)?|\+)a?)? — which now matches ddpa, dd+a, and ddplusa variants whilst maintaining backward compatibility with existing patterns.

The test suite confirms all expected cases pass:

• New cases: ddpa5.1, dd+a5.1, ddplusa5.1
• Existing cases: ddp5.1, dd+5.1, ddplus5.1, dd5.1, 5.1
• Formatted cases with spaces and separators

The modifications are additive, do not break any existing matches, and maintain consistency across all three affected channel configurations.

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