Create regex pattern for fluentd - ruby

Question

I'm using Fluentd configuration and regexp parser to parse the logs.
This are my original logs in fluentd:
2022-09-22 18:15:09,633 [springHikariCP housekeeper ] DEBUG HikariPool - springHikariCP - Fill pool skipped, pool is at sufficient level.
2022-09-22 18:15:14,968 [ringHikariCP connection closer] DEBUG PoolBase - springHikariCP - Closing connection com.mysql.cj.jdbc.ConnectionImpl#7f535ea4: (connection has passed maxLifetime)
I want to create json format for the above logs with regexp like this:
{
"logtime": "2022-09-22 18:15:09,633",
"Logger Name": "[springHikariCP housekeeper ]",
"Log level": "DEBUG",
"message": "HikariPool - springHikariCP - Fill pool skipped, pool is at sufficient level"
}
{
"logtime": "2022-09-22 18:15:09,633",
"Logger Name": "[ringHikariCP connection closer]",
"Log level": "DEBUG",
"message": "PoolBase - springHikariCP - Closing connectioncom.mysql.cj.jdbc.ConnectionImpl#7f535ea4: (connection has passed maxLifetime)"
}
Can someone with Ruby expirience help me to create Ruby regex for this logs above

Answer 1

The regex should be straightforward, e.g.
(?'logtime'\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d{3})\s(?'logname'\[[^\]]*\])\s(?'loglevel'\w+)\s(?'message'.*)
Online Test
And then, reassemble the parts using a substitution (gsub, see example below) or putting a new string together from the parts (match) :
re = /(?'logtime'\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d{3})\s(?'logname'\[[^\]]*\])\s(?'loglevel'\w+)\s(?'message'.*?$)/m
str = '2022-09-22 18:15:09,633 [springHikariCP housekeeper ] DEBUG HikariPool - springHikariCP - Fill pool skipped, pool is at sufficient level.
2022-09-22 18:15:14,968 [ringHikariCP connection closer] DEBUG PoolBase - springHikariCP - Closing connection com.mysql.cj.jdbc.ConnectionImpl#7f535ea4: (connection has passed maxLifetime)'
str.gsub(re) do |match|
puts "{
\"logtime\": \"#{$~[:logtime]}\",
\"Logger Name\": \"#{$~[:logname]}\",
\"Log level\": \"#{$~[:loglevel]}\",
\"message\": \"#{$~[:message]}\"
}"
end