VerbalExpressions/GoVerbalExpressions

go get github.com/VerbalExpressions/GoVerbalExpressions

// import with a nice name
import (
    "github.com/VerbalExpressions/GoVerbalExpressions" // imports verbalexpressions package
    "fmt"
)

func main () {
    v := verbalexpressions.New().
            StartOfLine().
            Then("http").
            Maybe("s").
            Then( "://").
            Maybe("www.").
            AnythingBut(" ").
            EndOfLine()

    testMe := "https://www.google.com"
    
    if v.Test(testMe) {
       fmt.Println("You have a valid URL") 
    } else {
       fmt.Println("URL is incorrect") 
    }
}

    // s will be "We have a blue house"
    s := verbalexpressions.New().Find("red").Replace("We have a red house", "blue")

    // c will be:
    // [
    //    ["http://www.google.com",  "http://", "www.google.com"]
    // ]
    c := verbalexpressions.New().
        BeginCapture().
            Find("http").Maybe("s").Find("://").
        EndCapture().
        BeginCapture().
            Find("www.").Anything().
        EndCapture().
        Captures("http://www.google.com")

    // check c[0][1] => http://
    //       c[0][2] => www.google.com