package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`^([a-zA-Z0-9].+?)(\s+)((?:(?!0000)[0-9]{4}-(?:(?:0[1-9]|1[0-2])-(?:0[1-9]|1[0-9]|2[0-8])|(?:0[13-9]|1[0-2])-(?:29|30)|(?:0[13578]|1[02])-31)|(?:[0-9]{2}(?:0[48]|[2468][048]|[13579][26])|(?:0[48]|[2468][048]|[13579][26])00)-02-29))(\s+)((0?9|1[0-9]|2[01]):00~(1[0-9]|2[0-2]):00)(\s+)([A-D])(\sC)`)
var str = []byte(`U001 2020-01-01 9:00~22:00 A C`)
var substitution = []byte("")
var count = 1 // negative counter is equivalent to global case (replace all)
str = re.ReplaceAllStringFunc(str, func(s string) string {
if count == 0 {
return s
}
count -= 1
return re.ReplaceAllString(s, substitution)
})
fmt.Println(string(str))
}
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/