How to do it...

1. Open the console and create the folder chapter02/recipe07.
2. Navigate to the directory.
3. Create the regexp.go file with the following content:

        package main

        import (
          "fmt"
          "regexp"
        )

        const refString = `[{ \"email\": \"email@example.com\" \
                             "phone\": 555467890},
                            { \"email\": \"other@domain.com\" \
                             "phone\": 555467890}]`

        func main() {

          // This pattern is simplified for brevity
          emailRegexp := regexp.MustCompile("[a-zA-Z0-9]{1,}
                                             @[a-zA-Z0-9]{1,}\\.[a-z]{1,}")
          first := emailRegexp.FindString(refString)
          fmt.Println("First: ")
          fmt.Println(first)

          all := emailRegexp.FindAllString(refString, -1)
          fmt.Println("All: ")
          for _, val := range all {
            fmt.Println(val)
          }

        }

1. Run the code by executing the go run regexp.go.
2. See the output in the Terminal: