Syslog (RFC 5424)

const re = new RegExp("^<(\\d{1,3})>(\\d+) (\\S+) (\\S+) (\\S+) (\\S+) (\\S+) (.*)$", "");
const input = "<165>1 2023-10-11T22:14:15.003Z mymachine.example.com evntslog - ID47 - Application event";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

import re

pattern = re.compile(r"^<(\d{1,3})>(\d+) (\S+) (\S+) (\S+) (\S+) (\S+) (.*)$")
input_text = "<165>1 2023-10-11T22:14:15.003Z mymachine.example.com evntslog - ID47 - Application event"
for m in pattern.finditer(input_text):
    print(m.group(0))

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`^<(\d{1,3})>(\d+) (\S+) (\S+) (\S+) (\S+) (\S+) (.*)$`)
	input := `<165>1 2023-10-11T22:14:15.003Z mymachine.example.com evntslog - ID47 - Application event`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}