package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(..\..).+\n(?<!not )undefined.+`)
var str = `datetime,n_dayAVG,n_nightAVG
2021-02-13T23:00:00Z,0,38.75689941512687
2021-02-14T06:00:00Z,42.928258741926456,39.480753102759024
2021-02-15T06:00:00Z,43.75857849703471,39.9099923987705
2021-02-16T06:00:00Z,40.64147976311876,39.62856460216651
2021-02-17T06:00:00Z,43.01380733014874,39.58893298143956
undefined,0,0`
if len(re.FindStringIndex(str)) > 0 {
fmt.Println(re.FindString(str),"found at index",re.FindStringIndex(str)[0])
}
}
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/