Invalid indentation level due to too long of regex

[jamesgoodhouse]

Bug Report

Describe the bug
When using a custom regex parser with a very long Regex, I receive the error Invalid indentation level when running Fluent Bit. This appears to be similar to issue #301 where the line buffer is not long enough.

To Reproduce
Create a parser with a very long Regex. I am using one that is currently 4,365 characters.

[PARSER]
    Name    test_parser
    Format  regex
    Regex   <<SUPER LONG REGEX HERE>

Consume said parser with a parser filter.

[FILTER]
    Name      parser
    Match     *
    Key_Name  log
    Parser    test_parser

Start Fluent Bit and you'll receive the error Invalid indentation level. Fluent Bit will also fail to start.

Expected behavior
I expect Fluent Bit to start without error or quitting and for my logs to be properly parsed.

Screenshots
N/A

Your Environment

• Version used: 1.0.4 (Docker version)
• Operating System and version: MacOS running containerized Fluent Bit
• Filters and plugins: Parser and Parser Filter

Additional context
We are parsing some complicated log for OpenLDAP and thus need a pretty gnarly regex to be able to parse and extract all of the fields.

[edsiper]

@jamesgoodhouse current limit is 4095 bytes.

I will see if we can make it bigger for a future release, but 4KB is a lot! :)