What is a good regular expression to match a URL

Question

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                                               var url  content match urlR     The problem is  when I enter a URL like www google com  its not working  when I entered http   www google com  it is working   I am not very fluent in regular expressions  Can anyone help me

User · Answer

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      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    x000D   x000D  var expression     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    gi  x000D  var regex   new RegExp expression   x000D   x000D  var check     x000D     http   www foufos gr   x000D     https   www foufos gr   x000D     http   foufos gr   x000D     http   www foufos gr kino   x000D     http   werer gr   x000D     www foufos gr   x000D     www mp3 com   x000D     www t co   x000D     http   t co   x000D     http   www t co   x000D     https   www t co   x000D     www aa com   x000D     http   aa com   x000D     http   www aa com   x000D     https   www aa com   x000D     www foufos   x000D     www foufos- gr   x000D     www -foufos gr   x000D     foufos gr   x000D     http   www foufos   x000D     http   foufos   x000D     www mp3  com  x000D     x000D   x000D  check forEach function entry    x000D    if  entry match regex     x000D          output   append    lt div  gt Success      entry     lt  div gt      x000D      else   x000D          output   append    lt div gt Fail      entry     lt  div gt      x000D      x000D      x000D   lt script src  https   cdnjs cloudflare com ajax libs jquery 3 3 1 jquery min js  gt  lt  script gt  x000D   lt div id  output  gt  lt  div gt  x000D   x000D   x000D    Check it in rubular - NEW version  Check it in rubular - old version

User · Answer

Another possible solution  above solution failed for me in parsing query string params   var regex   new RegExp    http s          www      ftp        www      www     1   0-9A-Za-z-                      a-zA-Z  2 3                           if regex test  http   google com       alert  Successful match     else    alert  No match        In this solution please feel free to modify  -0-9A-Za-z             to match the domain sub domain name  In this solution query string parameters are also taken care   If you are not using RegEx  then from the expression replace    by     Hope this helps

User · Answer

I was trying to put together some JavaScript to validate a domain name  ex  google com  and if it validates enable a submit button  I thought that I would share my code for those who are looking to accomplish something similar  It expects a domain without any http    or www  value  The script uses a stripped down regular expression from above for domain matching  which isn t strict about fake TLD   http   jsfiddle net nMVDS 1     function            whitelist add   keyup function          if    this  val              Check to see if there is any text entered           If there is no text within the input  disable the button             whitelistCheck   attr  disabled    disabled          else              Domain name regular expression         var regex   new RegExp     0-9A-Za-z-                      a-zA-Z  2 3                                  if  regex test   this  val                      Domain looks OK               alert  Successful match                    whitelistCheck   removeAttr  disabled              else                  Domain is NOT OK               alert  No match                    whitelistCheck   attr  disabled    disabled                                HTML FORM    lt form action  domain management php  method  get  gt       lt input type  text  name  whitelist add  id  whitelist add  placeholder  domain com  gt       lt button type  submit  class  btn btn-success whitelistCheck  disabled  disabled  gt Add to Whitelist lt  button gt   lt  form gt

User · Answer

These are the droids you re looking for   This is taken from validator js which is the library you should really use to do this   But if you want to roll your own  who am I to stop you   If you want pure regex then you can just take out the length check   I think it s a good idea to test the length of the URL though if you really want to determine compliance with the spec    function isURL str         var urlRegex        mailto        http https ftp          S       S                1-9   d  1  d  d 2 01   d 22 0-3           1   d 1 2  2 0-4   d 25 0-5    2           0-9   d  1  d  d 2 0-4   d 25 0-4           a-z  u00a1-  uffff0-9  -    a-z  u00a1-  uffff0-9             a-z  u00a1-  uffff0-9  -    a-z  u00a1-  uffff0-9              a-z  u00a1-  uffff  2      localhost       d 2 5                   s             var url   new RegExp urlRegex   i         return str length  lt  2083  amp  amp  url test str

User · Answer

Regex if you want to ensure URL starts with HTTP HTTPS   https       www     -a-zA-Z0-9            1 256    a-zA-Z0-9    1 6  b  -a-zA-Z0-9             amp          If you do not require HTTP protocol    -a-zA-Z0-9            1 256    a-zA-Z0-9    1 6  b  -a-zA-Z0-9             amp          To try this out see http   regexr com 37i6s  or for a version which is less restrictive http   regexr com 3e6m0   Example JavaScript implementation    x000D   x000D  var expression     -a-zA-Z0-9            1 256    a-zA-Z0-9    1 6  b  -a-zA-Z0-9             amp         gi  x000D  var regex   new RegExp expression   x000D  var t    www google com   x000D   x000D  if  t match regex     x000D    alert  Successful match    x000D    else   x000D    alert  No match    x000D    x000D   x000D   x000D

[javascript] What is a good regular expression to match a URL?

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