Android Code Snippet [B4X] Check is URL

Is not perfect, but most URLs should match it.

What is a good regular expression to match a URL?

Currently I have an input box which will detect the URL and parse the data. So right now, I am using: var urlR = /^(?:([A-Za-z]+):)?(\/{0,3})([0-9.\-A-Za-z]+) (?::(\d+))?(?:\/([^?#]*))...

stackoverflow.com

Private Sub isURL(url As String) As Boolean
    Return Regex.IsMatch("(https?:\/\/(?:www\.|(?!www))[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9]\.[^\s]{2,}|www\.[a-zA-Z0-9][a-zA-Z0-9-]+[a-zA-Z0-9]\.[^\s]{2,}|https?:\/\/(?:www\.|(?!www))[a-zA-Z0-9]+\.[^\s]{2,}|www\.[a-zA-Z0-9]+\.[^\s]{2,})$",url)
End Sub

    If isURL("https://stackoverflow.com/a/17773849") = True Then
        Log("valid URL")
        Else
            Log("is not a URL")
    End If

 

[JohnC]

I am a regex syntax newbie, but all I see is two mentions of "https" in the pattern, but I don't see just an "http".

So I just was wondering if a url just had http and not https, will it pass the test?

 

[Alexander Stolte]

So I just was wondering if a url just had http and not https, will it pass the test?

click on the link and you will see the following:

Will match the following cases

• http://www.foufos.gr
• https://www.foufos.gr
• http://foufos.gr
• http://www.foufos.gr/kino
• http://werer.gr
• www.foufos.gr
• www.mp3.com
• www.t.co
• http://t.co
• http://www.t.co
• https://www.t.co
• www.aa.com
• http://aa.com
• http://www.aa.com
• https://www.aa.com

Will NOT match the following

• www.foufos
• www.foufos-.gr
• www.-foufos.gr
• foufos.gr
• http://www.foufos
• http://foufos
• www.mp3#.com