My ideal regex would return true if the serial matched something like below.
A12T-4GH7-QPL9-3N4M
Here is what I tried.
package main
import "fmt"
import "regexp"
func main() {
a := "A12T-A12T"
re := regexp.MustCompile("[a-zA-Z0-9]-[a-zA-Z0-9]")
fmt.Println(re.MatchString(a))
b := "A12T-A12T-"
re2 := regexp.MustCompile("[a-zA-Z0-9]-[a-zA-Z0-9]-")
fmt.Println(re2.MatchString(b))
}
Observe how the variable a is true but as soon as b is called it returns false with the extra hyphen.
My question is, how do I add multiple hyphens in-between alphanumeric characters for this ideal sequence A12T-4GH7-QPL9-3N4M
CodePudding user response：
You need to use
regexp.MustCompile("^[a-zA-Z0-9] (?:-[a-zA-Z0-9] )*$")
The pattern matches
^- start of string[a-zA-Z0-9]- one or more alphanumeric(?:-[a-zA-Z0-9] )*- zero or more occurrences of a hyphen and then one or more alphanumeric chars$- end of string.
See the regex demo.
CodePudding user response：
The regexp you've used matches only 3 (4 in the second example) characters.
If you want to match a set of characters separated by hyphens, you should try a regexp like ([a-zA-Z0-9] -) [a-zA-Z0-9]
which translates to code as:
package main
import "fmt"
import "regexp"
func main() {
a := "A12T-4GH7-QPL9-3N4M"
re := regexp.MustCompile("([a-zA-Z0-9] -) [a-zA-Z0-9] ")
fmt.Println(re.MatchString(a))
}