Apache Common Log Format in GO
Parses Apache Common Log Format entries.
Try it in the GO tester →Pattern
regexGO
^(\S+) (\S+) (\S+) \[([^\]]+)\] "(\S+) (\S+) (\S+)" (\d{3}) (\d+|-)Go (RE2) code
goGo
package main
import (
"fmt"
"regexp"
)
func main() {
re := regexp.MustCompile(`^(\S+) (\S+) (\S+) \[([^\]]+)\] "(\S+) (\S+) (\S+)" (\d{3}) (\d+|-)`)
input := `127.0.0.1 - frank [10/Oct/2023:13:55:36 -0700] "GET /index.html HTTP/1.0" 200 2326`
for _, match := range re.FindAllString(input, -1) {
fmt.Println(match)
}
}Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.
How the pattern works
Captures 9 fields: host, ident, user, timestamp, method, path, protocol, status code, and response size.
Examples
Input
127.0.0.1 - frank [10/Oct/2023:13:55:36 -0700] "GET /index.html HTTP/1.0" 200 2326Matches
127.0.0.1 - frank [10/Oct/2023:13:55:36 -0700] "GET /index.html HTTP/1.0" 200 2326