Golang正则复杂匹配与实战示例

logLine := `2024-05-20T10:30:45Z ERROR failed to connect to db: timeout`
re := regexp.MustCompile(`(?P<time>\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z)\s+(?P<level>\w+)\s+(?P<msg>.+)`)
match := re.FindStringSubmatch(logLine)
result := make(map[string]string)
for i, name := range re.SubexpNames() {
    if i != 0 && name != "" {
        result[name] = match[i]
    }
}
// 输出: map[time:2024-05-20T10:30:45Z level:ERROR msg:failed to connect to db: timeout]

input := `call("getUser", id=123, retry=true)`
// 匹配函数名及多个键值对参数
re := regexp.MustCompile(`(\w+)\(([^)]*)\)`)
if matches := re.FindStringSubmatch(input); len(matches) > 0 {
    funcName := matches[1]
    argsStr := matches[2]
// 进一步拆分参数
argRe := regexp.MustCompile(`(\w+)=("[^"]*"|\w+)`)
args := make(map[string]string)
for _, arg := range argRe.FindAllStringSubmatch(argsStr, -1) {
    args[arg[1]] = arg[2]
}
// funcName: "call", args: map[id:123 retry:true]
}

log := `192.168.1.10 - - [10/May/2024:12:34:56 +0000] "GET /api/v1/users HTTP/1.1" 200 1024`
pattern := `(?P<ip>[\d\.]+) - - \[(?P<time>[^\]]+)\] "(?P<method>\w+) (?P<path>[^\s]+)[^"]*" (?P<status>\d{3}) (?P<size>\d+)`
re := regexp.MustCompile(pattern)
names := re.SubexpNames()
values := re.FindStringSubmatch(log)
parsed := make(map[string]string)
for i, val := range values {
if i > 0 {
parsed[names[i]] = val
}
}