package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(\d+\.([1-9]{3}|[1-9]{2}|[1-9]|0{1}))(\d*)`)
var str = `#提取有效小数的思路：匹配出符合要求的组合不符合要求的组。
#使用sub函数，re.sub(pat,lambda m:m[1],s)
#repl使用函数，传递的参数是pat,所匹配的match对象，提取match对象中符合要求的组即可。
124.1230000012
124.1200003412
123.0000000012
1.2000
`
for i, match := range re.FindAllString(str, -1) {
fmt.Println(match, "found at index", i)
}
}
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/