How to check whether a string is a valid HTTP URL

Question

There are the Uri IsWellFormedUriString and Uri TryCreate methods  but they seem to return true for file paths etc   How do I check whether a string is a valid  not necessarily active  HTTP URL for input validation purposes

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bool passed   Uri TryCreate url  UriKind Absolute  out Uri uriResult   amp  amp   uriResult Scheme    Uri UriSchemeHttp    uriResult Scheme    Uri UriSchemeHttps

User · Answer

Try that   bool IsValidURL string URL        string Pattern         http s           w -         w  -      w -                amp                        Regex Rgx   new Regex Pattern  RegexOptions Compiled   RegexOptions IgnoreCase       return Rgx IsMatch URL       It will accept URL like that    http s    www example com http s    stackoverflow example com http s    www example com page http s    www example com page id 1 amp product 2 http s    www example com page start http s    www example com 8080 http s    127 0 0 1 127 0 0 1 www example com example com

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All the answers here either allow URLs with other schemes  e g   file     ftp     or reject human-readable URLs that don t start with http    or https     e g   www google com  which is not good when dealing with user inputs   Here s how I do it   public static bool ValidHttpURL string s  out Uri resultURI        if   Regex IsMatch s     https         RegexOptions IgnoreCase           s    http       s       if  Uri TryCreate s  UriKind Absolute  out resultURI           return  resultURI Scheme    Uri UriSchemeHttp                     resultURI Scheme    Uri UriSchemeHttps        return false      Usage   string   inputs   new                                https   www google com                              http   www google com                              www google com                              google com                              javascript alert  Hack me                                foreach  string s in inputs        Uri uriResult      bool result   ValidHttpURL s  out uriResult       Console WriteLine result     t    uriResult  AbsoluteUri       Output   True    https   www google com  True    http   www google com  True    http   www google com  True    http   google com  False

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public static bool CheckURLValid this string source                Uri uriResult          return Uri TryCreate source  UriKind Absolute  out uriResult   amp  amp  uriResult Scheme    Uri UriSchemeHttp          Usage   string url    htts   adasd xc    if url CheckUrlValid          valid process     UPDATE   single line of code  Thanks  GoClimbColorado  public static bool CheckURLValid this string source    gt  Uri TryCreate source  UriKind Absolute  out Uri uriResult   amp  amp  uriResult Scheme    Uri UriSchemeHttps    Usage   string url    htts   adasd xc    if url CheckUrlValid          valid process

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This would return bool   Uri IsWellFormedUriString a GetAttribute  href    UriKind Absolute

User · Answer

Try this to validate HTTP URLs  uriName is the URI you want to test    Uri uriResult  bool result   Uri TryCreate uriName  UriKind Absolute  out uriResult        amp  amp  uriResult Scheme    Uri UriSchemeHttp    Or  if you want to accept both HTTP and HTTPS URLs as valid  per J0e3gan s comment    Uri uriResult  bool result   Uri TryCreate uriName  UriKind Absolute  out uriResult        amp  amp   uriResult Scheme    Uri UriSchemeHttp    uriResult Scheme    Uri UriSchemeHttps

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Uri uri   null  if   Uri TryCreate url  UriKind Absolute  out uri     null    uri      return false  else     return true    Here url is the string you have to test

User · Answer

After Uri TryCreate you can check Uri Scheme to see if it HTTP s

User · Answer

This method works fine both in http and https  Just one line     if  Uri IsWellFormedUriString  https   www google com   UriKind Absolute     MSDN  IsWellFormedUriString

[c#] How to check whether a string is a valid HTTP URL?

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