Regex extracting sets of numbers from string when prefix occurs, while not matching said prefix

As stated in the title, given a situation where I have a string like so:

"somestring~200~122"

I am wanting to regex to match the numbers when the prefix "~" occurs. So I can ultimately end up with [200, 122].

Matching the prefix is necessary as I need to protect against a case where a string like the one below should not be matched

"somestring~abc200~def122"

For additional context: As stated in the title, I am using go so I am planning on using doing something like the following in order to obtain the numbers within the string:

pattern := regexp.MustCompile("regex i need help with")
numbers := pattern.FindAllString(host, -1)

You can use FindAllStringSubmatch to extract the group containing just the digits. Below is an example that finds all instances of ~ followed by numbers. It additionally converts all the matches to ints
and inserts them into a slice:

package main

import (
	"fmt"
	"regexp"
	"strconv"
)

func main() {
	host := "somestring~200~122"
	pattern := regexp.MustCompile(`~(\d+)`)
	numberStrings := pattern.FindAllStringSubmatch(host, -1)
	numbers := make([]int, len(numberStrings))
	for i, numberString := range numberStrings {
		number, err := strconv.Atoi(numberString[1])
		if err != nil {
			panic(err)
		}
		numbers[i] = number
	}
	fmt.Println(numbers)
}

https://play.golang.org/p/09YyewtRXz