package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)([3-9][0-9]{3}|2[1-9][0-9]{2}|20[3-9][0-9]|202[1-9])-[0-9]{2}-[0-9]{2}|2020-1[0-9]-[0-9]{2}|2020-09-2[2-9]`)
var str = `2019-09-22
2020-08-22
2020-09-21
2020-09-22
2020-09-23
2020-10-22
2021-09-22`
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/