"Unknown escape sequence" error in Go

Question

I have the following function written in Go. The idea is the function has a string passed to it and returns the first IPv4 IP address found. If no IP address is found, an empty string is returned.

func parseIp(checkIpBody string) string {
    reg, err := regexp.Compile("[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+")
    if err == nil {
        return ""
    }   
    return reg.FindString(checkIpBody)
}

The compile-time error I'm getting is

unknown escape sequence: .

How can I tell Go that the '.' is the actual character I'm looking for? I thought escaping it would do the trick, but apparently I'm wrong.

Answer 1

IPv4 address (accurate capture)

Matches 0.0.0.0 through 255.255.255.255

Use this regex to match IP numbers with accurracy.

Each of the 4 numbers is stored into a capturing group, so you can access them for further processing.

"(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])"

Answer 2

You can use the following. You can of course change the post type according to your needs.

add_action( 'init', function() {
    remove_post_type_support( 'post', 'editor' );
    remove_post_type_support( 'page', 'editor' );
}, 99);