How to check if a string contains http:// at the start

Question

I want to be able to check a string to see if it has http:// at the start and if not to add it.

if (regex expression){
string = "http://"+string;
}

Does anyone know the regex expression to use?

Answer 1

 /^http:\/\//

Answer 2

In JavaScript:

if(!(/^http:\/\//.test(url)))
{
    string = "http://" + string;
}

Answer 3

Should be:

/^http:\/\//

And remember to use this with ! or not (you didn't say which programming language), since you are looking for items which don't match.

Answer 4

Something like this should work ^(https?://)

Answer 5

If you don't need a regex to do this (depending on what language you're using), you could simply look at the initial characters of your string. For example:

if (!string.StartsWith("http://"))
    string = "http://" + string;
//or//
if (string.Substring(0, 7) != "http://")
    string = "http://" + string;`

Answer 6

If javascript is the language needed here, then look at this post which adds "startswith" property to the string type.

Answer 7

yourString = yourString.StartWith("http://") ? yourString : "http://" + yourString

Is more sexy