package main
import (
"fmt"
"strings"
"unicode"
)
// RemoveNonNumeric removes all non-numeric characters from the input string,
// returning a new string containing only digits.
func RemoveNonNumeric(input string) string {
var sb strings.Builder
// Pre-allocate memory in the builder buffer up to the length of the input
// to prevent dynamic reallocations during iteration.
sb.Grow(len(input))
// Iterate over the string character by character (handling UTF-8 runes properly)
for _, r := range input {
if unicode.IsDigit(r) {
sb.WriteRune(r)
}
}
return sb.String()
}
func main() {
// Test string provided
text := "123XYZ +9982-programming 10000000000001language"
// Process the string
cleanedText := RemoveNonNumeric(text)
// Output results
fmt.Printf("Original: %s\n", text)
fmt.Printf("Cleaned: %s\n", cleanedText)
}
/*
run:
Original: 123XYZ +9982-programming 10000000000001language
Cleaned: 123998210000000000001
*/
