Golang GSM 03.38 7-bit alphabet regular expressions example. See definition: https://en.wikipedia.org/wiki/GSM_03.38

main.go

package main

import (
	"fmt"
	"regexp"
)

func main() {
	// GSM 3.38 7-bit string
	const GSM0338Regex = `[^A-Za-z0-9 \\r\\n@£$¥èéùìòÇØøÅåΔ_ΦΓΛ¤ΩΠΨΣΘΞÆæßÉ!\"#$%&amp;'()*+,./:;&lt;=&gt;?¡ÄÖÑܧ¿äöñüà^{}\[\~\|\]\<\>\-\\€]*`

	testString := "你好HelloWorldこんにちは"
	regexpHelper := regexp.MustCompile(GSM0338Regex)

	for index, match := range regexpHelper.FindAllString(testString, -1) {
		if len(match) > 0 {
			fmt.Println(index, ":", match)
		}
	}
}