Regex: Extract messages from Rails logs

Today, I wanted to extract only the message fields from JSON-formatted Ruby on Rails logs in my terminal.

So, I created this simple regular expression to accomplish this easily using a lookahead and lookbehind:

^.*,(?="message")|(?<="message":".*").*

Copying and pasting the relevant logs into VS Code and then replacing all text matched by this regex did the trick.

Ain’t regex fun? ^_^

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Update: This is a slightly improved version that doesn’t choke on \" within messages:

^.*,(?="message")|(?<="message":".*(?<!\\)").*

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