package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)^P((((([0-9]+Y([0-9]+M)?([0-9]+[DW])?)|([0-9]+M([0-9]+[DW])?)|([0-9]+[DW]))(T(([0-9]+H([0-9]+M)?([0-9]+S)?)|([0-9]+M([0-9]+S)?)|([0-9]+S)))?|(T(([0-9]+H([0-9]+M)?([0-9]+S)?)|([0-9]+M([0-9]+S)?)|([0-9]+S)))))|(([0-9]{4}-(0[0-9]|1[0-2])-([0-2][0-9]|3[0-1]))T(([0-1][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9])))$`)
var str = `P0Y1M2DT3H4M5S
P0Y1M2WT3H4M5S
P0Y1M2DT3H
P0YT3H4M5S
P0YT3H
P0Y1M2D
P0Y`
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/