How to implement log message filtering and suppression based on patterns in Go?

To implement log message filtering and suppression based on patterns in Go, you can make use of the log package along with regular expressions. Here's a step-by-step guide:

Step 1: Import the required packages:

import (
	"log"
	"regexp"
)

Step 2: Create a regular expression pattern that matches the log messages you want to filter or suppress. For example, let's say you want to filter out log messages containing the word "error":

pattern := regexp.MustCompile(`error`)

Step 3: Create a custom logger function that accepts the log message and applies the filtering logic:

func FilteredLogger(message string) {
	if pattern.MatchString(message) {
		// Filter/suppress the log message
		return
	}
	log.Println(message)
}

Step 4: Replace the default logger with your custom logger:

log.SetFlags(0) // Disable default date/time prefix
log.SetOutput(&logWriter{})

Step 5: Use the FilteredLogger function to log messages:

FilteredLogger("This is a sample log message")
FilteredLogger("This is an error message")

The above code will filter/suppress log messages containing the word "error" while printing the others.

Note: To apply multiple patterns or complex filtering logic, you can modify the regular expression or create multiple regular expressions and apply them sequentially in the custom logger function.