Unconditional rewrite_tag regardless of record data

[ryan65]

Hi
I would like to unconditionally rewrite the tag , if it matches a certain value (or regex). for example below , if the Tag in the input was set to tag1 tag2 tag3 I would like to change it to Tag_General, I dont care about the actual record data.
Is there any existing way to do something like this .?
I tried using $TAG in the rule as the key and then use a regex , but caused seg fault.

I am looking for something like this.
[FILTER]
Name rewrite_tag
match_regex (tag1|tag2|tag3)
Rule [ignore] [ignore] Tag_General false
Emitter_Name re_emitted

[nokute78]

A workaround is to use filter_lua.

$ ../bin/fluent-bit -c a.conf 
Fluent Bit v2.0.0
* Copyright (C) 2015-2022 The Fluent Bit Authors
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io

[2022/08/12 13:54:33] [ info] [fluent bit] version=2.0.0, commit=fc325524d5, pid=36618
[2022/08/12 13:54:33] [ info] [storage] version=1.2.0, type=memory-only, sync=normal, checksum=disabled, max_chunks_up=128
[2022/08/12 13:54:33] [ info] [cmetrics] version=0.3.5
[2022/08/12 13:54:33] [ info] [sp] stream processor started
[2022/08/12 13:54:33] [ info] [output:stdout:stdout.0] worker #0 started
[0] Tag_General: [1660280074.748267173, {"tag"=>"tag1", "test"=>"message1"}]
[1] Tag_General: [1660280074.748463153, {"tag"=>"tag2", "test"=>"message2"}]
[2] Tag_General: [1660280074.748533248, {"tag"=>"tag3", "test"=>"message3"}]

[INPUT]
    Name dummy
    tag tag1
    Dummy {"test":"message1"}

[INPUT]
    Name dummy
    tag tag2
    Dummy {"test":"message2"}

[INPUT]
    Name dummy
    tag tag3
    Dummy {"test":"message3"}

[FILTER]
    Name lua
    Match tag*
    script append_tag.lua
    call append_tag

[FILTER]
    Name rewrite_tag
    Match tag*
    Rule tag tag* Tag_General false

[OUTPUT]
    Name stdout
    Match *

The lua script is https://github.com/fluent/fluent-bit/blob/master/scripts/append_tag.lua

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