Slack User Mention

const re = new RegExp("<@U[A-Z0-9]{8,}>", "g");
const input = "cc <@U01234ABC> please review";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

import re

pattern = re.compile(r"<@U[A-Z0-9]{8,}>")
input_text = "cc <@U01234ABC> please review"
for m in pattern.finditer(input_text):
    print(m.group(0))

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`<@U[A-Z0-9]{8,}>`)
	input := `cc <@U01234ABC> please review`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}