Regex Not Matching Specific Pattern for Custom Log Format in Go
I can't seem to get I'm performance testing and I'm trying to parse a custom log format in Go using regex, but I'm having trouble matching specific components of the log entries. The logs look like this: ``` 2023-10-01 14:32:45 INFO [user_id:1234] Request completed successfully 2023-10-01 14:33:10 behavior [user_id:5678] Failed to process request ``` I want to extract the timestamp, log level, user ID, and the message separately. My current regex pattern is: ```go pattern := `^(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}) (\w+) \[user_id:(\d+)\] (.+)$` ``` When I test it with `regexp.MustCompile(pattern)`, it compiles without errors, but when I use it to match a log entry, it returns no matches. I tried using `re.FindStringSubmatch(logEntry)` but the result is always an empty slice. I also checked for leading/trailing spaces and verified that the log entries are formatted correctly, but still no luck. Here’s how I'm currently using it: ```go logEntry := "2023-10-01 14:32:45 INFO [user_id:1234] Request completed successfully" re := regexp.MustCompile(pattern) matches := re.FindStringSubmatch(logEntry) fmt.Println(matches) ``` I'm using Go version 1.19. Am I missing something in my regex pattern? Should I be handling something differently to capture the log format correctly? Any insights would be appreciated! Any ideas how to fix this? I'm using Go latest in this project. Am I missing something obvious?