dvr_apply with regex pattern breaks DVR recording, while unset dvr_apply works

[bfwl]

Issue Description:

I'm using SRS v6.0.101 (Docker deployment) and encountered an issue with dvr_apply regex matching:

Expected Behavior:

Use regex in dvr_apply to selectively record streams (e.g., exclude streams containing 165-0-7).

Example config:

dvr {
enabled on;
dvr_path ./objs/nginx/html/[app]/[stream]/[timestamp].flv;
dvr_apply ^(?!.165-0-7).$; # Exclude streams with "165-0-7"
}

Actual Behavior:
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When dvr_apply is not set, DVR works perfectly (all streams are recorded).
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When dvr_apply is set (even with simple regex like .*), no streams are recorded.
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No errors in logs (docker logs shows no regex-related warnings).
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Questions:
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Is regex (PCRE) supported in dvr_apply? If yes, what syntax should be used?
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Are there any known limitations or workarounds for this issue?

Environment:

SRS Version: 6.0.101

OS: Linux (Docker)

TRANS_BY_GPT4

[bfwl]

Title: Alternative ways to control DVR recording programmatically after HTTP RAW API removal
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Description:
I need to implement dynamic control over which streams should be recorded based on business logic in my backend service. Previously, I could have used the HTTP RAW API for this, but I understand it has been removed in current SRS versions.
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My Requirements:
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All streams should be allowed to publish (no blocking via on_publish)
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Recording should be enabled/disabled per-stream based on:
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Complex business rules from my backend
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Database lookups
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User permissions
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What I've Considered:
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on_dvr callback + file deletion:
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Works but inefficient (records then deletes)
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Wastes disk I/O on unwanted recordings
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Question:
What are the recommended approaches to implement programmatic recording control in current SRS versions? Specifically:
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Is there a supported way to dynamically enable/disable DVR per stream through the existing API?

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[winlinvip]

The dvr_apply does NOT support regex patterns - it only supports exact string matching.

How dvr_apply actually works:

• "Record all streams" command.
• "Record only the streams specified as 'live/stream1' or 'live/stream2'" command.
• Any other value (including regex like .* or ^(?!.*165-0-7).*$) is treated as a literal string to match

TRANS_BY_GPT4