Android Question Validate a URL / Website name in EditText

hanyelmehy · Dec 25, 2019

any idea about best way to Validate a URL / Website to avoid errors before useing HttpJob
something like

B4X:

private boolean isValidUrl(String url) {
      Pattern p = Patterns.WEB_URL;
      Matcher m = p.matcher(url.toLowerCase());
      if(m.matches())
         return true;
      else
        return false;
}

Erel · Dec 27, 2019

B4X:

Sub IsUrl (s As String) As Boolean
    Return Regex.IsMatch("https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)", s)
End Sub

Source: https://stackoverflow.com/a/3809435/971547

udg · Dec 27, 2019

Just googling for "regex url validate" gives back a few interesting results.
A couple of them (no special reason to select them):

In search of the perfect URL validation regex

mathiasbynens.be

Index of /

urlregex.com

Edit: Erel was quicker than me (once more eheh)

peacemaker · Jan 28, 2020

So many regexp variants on the internet, and each does not cover something...
I have made for me:

B4X:

Sub IsUrl (s As String) As Boolean
    If s.Trim = "" Then Return False
    If s.Length < 9 Then Return False
    If s.ToLowerCase.StartsWith("http") = False Then Return False   'update as needed for you
    If s.Contains(".") = False Then Return False
    If s.Contains(":/") = False Then Return False
    If s.Contains("//") = False Then Return False
    Return True
End Sub

udg · Jan 28, 2020

So http..://../anything is ok?

Android Question Validate a URL / Website name in EditText

hanyelmehy

Well-Known Member

Erel

B4X founder

udg

Expert

In search of the perfect URL validation regex

Index of /

peacemaker

Expert

udg

Expert

Similar Threads

Android Question Validate a URL / Website name in EditText

hanyelmehy

Well-Known Member

Erel

B4X founder

udg

Expert

In search of the perfect URL validation regex

Index of /

peacemaker

Expert

udg

Expert

Similar Threads

Privacy & Transparency

Privacy & Transparency