To remove all the digits from a string in Go, you can use a combination of the strings and unicode packages.

Here's an example of how you can do this:

Go: 
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package main

import (
	"fmt"
	"strings"
	"unicode"
)

func main() {
	// The input string with digits
	input := "Hello123World456"

	// Create a new string builder
	var builder strings.Builder

	// Iterate over the input string
	for _, r := range input {
		// If the current character is not a digit, append it to the string builder
		if !unicode.IsDigit(r) {
			builder.WriteRune(r)
		}
	}

	// Get the resulting string from the string builder
	output := builder.String()

	// Print the resulting string
	fmt.Println(output) // Output: "HelloWorld"
}

This code iterates over the characters in the input string and checks if each character is a digit using the unicode.IsDigit function. If the character is not a digit, it is appended to a strings.Builder object. Finally, the resulting string is obtained from the string builder using the String method.

An other way:

Go: regexp
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package main

import (
	"fmt"
	"regexp"
)

func main() {
	Input := "H1e5ll0o"
	re := regexp.MustCompile(`\d`)
	fmt.Println(Input)
	Output := re.ReplaceAllString(Input, "")
	fmt.Println(Output) // "Hello"
}