Regex scenarios to Parse Custom Log Formats with Nested Brackets in Go - Need guide with Complex Patterns
I'm attempting to set up I've looked through the documentation and I'm still confused about I'm optimizing some code but I've been struggling with this for a few days now and could really use some help. I'm working on a Go application where I need to parse log entries that contain nested brackets. The log format looks something like this: ``` INFO [2023-10-12 14:22:01] [user: {id: 123, name: 'Alice'}] - Action performed successfully ``` The scenario arises when I try to extract the timestamp and the user information since the user information is enclosed in curly braces within the brackets. I've tried using the following regex pattern: ```go pattern := `INFO \[(?P<timestamp>[^]]+)\] \[user: \{(?P<userInfo>[^}]+)\}\]` ``` However, when I run this code, it doesn't capture the `userInfo` correctly. The results I get are often unexpected, and I see no matches or partial matches, especially when the user info contains commas or additional nested structures. I attempted to debug the regex using the `regexp` package in Go, and here's the implementation I have: ```go package main import ( "fmt" "regexp" ) func main() { log := "INFO [2023-10-12 14:22:01] [user: {id: 123, name: 'Alice'}] - Action performed successfully" pattern := `INFO \[(?P<timestamp>[^]]+)\] \[user: \{(?P<userInfo>[^}]+)\}\]` re := regexp.MustCompile(pattern) matches := re.FindStringSubmatch(log) fmt.Println(matches) } ``` When I execute this, I get an empty `matches` array, and I suspect it's due to the greedy nature of the regex or maybe the incorrect capture groups. I've tried several variations, including simplifying the pattern and adjusting the brackets, but nothing seems to work. What would be a correct approach to capture both the timestamp and the nested user information using regex in Go? Any insights or recommendations on how to construct the regex to handle this specific log format would be greatly appreciated! My development environment is Windows. I've been using Go for about a year now. Thanks for any help you can provide! This is happening in both development and production on Windows 11. What's the correct way to implement this?