package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)^(\d*(?:\.\d+)?)`)
var str = `0.2
2.2
2.0
.2
2.2.
0.2.
2.2.2.2.2
0.2.2.2
.22.2.2.2
2222.22
2.
222.`
var substitution = "$1"
fmt.Println(re.ReplaceAllString(str, substitution))
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Golang, please visit: https://golang.org/pkg/regexp/