#25635: URLValidator regex is not allowing '+' character in scheme and also 
scheme
part is optional
--------------------------------+------------------------------------------
     Reporter:                  |      Owner:  nobody
  DheerendraRathor              |
         Type:  Bug             |     Status:  new
    Component:  Core (Other)    |    Version:  1.8
     Severity:  Normal          |   Keywords:  urlvalidator, regexvalidator
 Triage Stage:  Unreviewed      |  Has patch:  0
Easy pickings:  0               |      UI/UX:  0
--------------------------------+------------------------------------------
 Quoting w3's url-spec
  A complete URL consists of a naming scheme specifier followed by a string
 whose format is a function of the naming scheme.
 and
  Within the URL of a object, the first element is the name of the scheme,
 separated from the rest of the object by a colon. The rest of the URL
 follows the colon in a format depending on the scheme.

 So basically scheme should be present in URL syntax. Current scheme regex
 is `^(?:[a-z0-9\.\-]*)://` which allows empty schemes.

 Also schemes should allow alphanumeric characters with `-`, `.` and `+`
 ([https://tools.ietf.org/html/rfc1738#section-2.1 rfc1738]).

--
Ticket URL: <https://code.djangoproject.com/ticket/25635>
Django <https://code.djangoproject.com/>
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