Extract hostname name from string

Question

I would like to match just the root of a URL and not the whole URL from a text string  Given    http   www youtube com watch v ClkQA2Lb iE http   youtu be ClkQA2Lb iE http   www example com 12xy45 http   example com random   I want to get the 2 last instances resolving to the www example com or example com domain    I heard regex is slow and this would be my second regex expression on the page so If there is anyway to do it without regex let me know   I m seeking a JS jQuery version of this solution

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2020 answer You don t need any extra dependencies for this  Depending on whether you need to optimize for performance or not  there are two good solutions  1  Use URL hostname for readability In the Babel era  the cleanest and easiest solution is to use URL hostname   x000D   x000D  const getHostname    url    gt         use URL constructor and return hostname   return new URL url  hostname        tests console log getHostname  https   stackoverflow com questions 8498592 extract-hostname-name-from-string      console log getHostname  https   developer mozilla org en-US docs Web API URL hostname     x000D   x000D   x000D   URL hostname is part of the URL API  supported by all major browsers except IE  caniuse   Use a URL polyfill if you need to support legacy browsers  Using this solution will also give you access to other URL properties and methods  This will be useful if you also want to extract the URL s pathname or query string params  for example   2  Use RegEx for performance URL hostname is faster than using the anchor solution or parseUri  However it s still much slower than gilly3 s regex   x000D   x000D  const getHostnameFromRegex    url    gt         run against regex   const matches   url match   https                              i        extract hostname  will be null if no match is found    return matches  amp  amp  matches 1         tests console log getHostnameFromRegex  https   stackoverflow com questions 8498592 extract-hostname-name-from-string      console log getHostnameFromRegex  https   developer mozilla org en-US docs Web API URL hostname     x000D   x000D   x000D   Test it yourself on this jsPerf  TL DR If you need to process a very large number of URLs  where performance would be a factor   use RegEx  Otherwise  use URL hostname

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This is not a full answer  but the below code should help you   function myFunction         var str    https   www 123rf com photo 10965738 lots-oop html       matches   str split           return matches 2       I would like some one to create code faster than mine  It help to improve my-self also

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I tried to use the Given solutions  the Chosen one was an overkill for my purpose and  Creating a element  one messes up for me   It s not ready for Port in URL yet  I hope someone finds it useful  function parseURL url       parsed url           if   url    null    url length    0           return parsed url       protocol i   url indexOf             parsed url protocol   url substr 0 protocol i        remaining url   url substr protocol i   3  url length       domain i   remaining url indexOf           domain i   domain i    -1   remaining url length - 1   domain i      parsed url domain   remaining url substr 0  domain i       parsed url path   domain i    -1    domain i   1    remaining url length   null   remaining url substr domain i   1  remaining url length        domain parts   parsed url domain split           switch   domain parts length            case 2            parsed url subdomain   null            parsed url host   domain parts 0             parsed url tld   domain parts 1             break          case 3            parsed url subdomain   domain parts 0             parsed url host   domain parts 1             parsed url tld   domain parts 2             break          case 4            parsed url subdomain   domain parts 0             parsed url host   domain parts 1             parsed url tld   domain parts 2          domain parts 3             break             parsed url parent domain   parsed url host         parsed url tld       return parsed url        Running this   parseURL  https   www facebook com 100003379429021 356001651189146      Result   Object       domain    www facebook com       host    facebook       path    100003379429021 356001651189146       protocol    https       subdomain    www       tld    com

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Here s the jQuery one-liner       lt a gt    attr  href   url  prop  hostname

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Try below code for exact domain name using regex    String line    http   www youtube com watch v ClkQA2Lb iE      String pattern3      w  W                  w         Pattern r   Pattern compile pattern3       Matcher m   r matcher line     if  m find            System out println  Found value      m group 2         else        System out println  NO MATCH

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I personally researched a lot for this solution  and the best one I could find is actually from CloudFlare s  browser check    function getHostname                  secretDiv   document createElement  div                secretDiv innerHTML     lt a href     gt x lt  a gt                secretDiv   secretDiv firstChild href              var HasHTTPS   secretDiv match  https         0               secretDiv   secretDiv substr HasHTTPS length               secretDiv   secretDiv substr 0  secretDiv length - 1               return secretDiv          getHostname      I rewritten variables so it is more  human  readable  but it does the job better than expected

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Just use the URL   constructor   new URL url  host

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A neat trick without using regular expressions   var tmp          document createElement   a        tmp href      http   www example com 12xy45       tmp hostname will now contain  www example com     tmp host will now contain hostname and port  www example com 80    Wrap the above in a function such as the below and you have yourself a superb way of snatching the domain part out of an URI   function url domain data      var    a        document createElement  a             a href   data    return a hostname

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parse-domain - a very solid lightweight library  npm install parse-domain  const   fromUrl  parseDomain     require  parse-domain      Example 1  parseDomain fromUrl  http   www example com 12xy45        type   LISTED     hostname   www example com     labels     www    example    com       icann       subDomains     www          domain   example        topLevelDomains     com         subDomains     www       domain   example     topLevelDomains     com        Example 2  parseDomain fromUrl  http   subsub sub test ExAmPlE coM 12xy45        type   LISTED     hostname   subsub sub test example com     labels     subsub    sub    test    example    com       icann       subDomains     subsub    sub    test          domain   example        topLevelDomains     com         subDomains     subsub    sub    test       domain   example     topLevelDomains     com        Why   Depending on the use case and volume I strongly recommend against solving this problem yourself using regex or other string manipulation means  The core of this problem is that you need to know all the gtld and cctld suffixes to properly parse url strings into domain and subdomains  these suffixes are regularly updated  This is a solved problem and not one you want to solve yourself  unless you are google or something   Unless you need the hostname or domain name in a pinch don t try and parse your way out of this one

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There is no need to parse the string  just pass your URL as an argument to URL constructor  const url    http   www youtube com watch v ClkQA2Lb iE   const   hostname     new URL url    console assert hostname      www youtube com

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My code looks like this  Regular expressions can come in many forms  and here are my test cases I think it s more scalable    x000D   x000D  function extractUrlInfo url   x000D    let reg         lt protocol gt http s             lt host gt    d 1 2  1 d d 2 0-4  d 25 0-5      d 1 2  1 d d 2 0-4  d 25 0-5      d 1 2  1 d d 2 0-4  d 25 0-5      d 1 2  1 d d 2 0-4  d 25 0-5    -a-zA-Z0-9            1 256    a-zA-Z0-9    1 6  b  -a-zA-Z0-9             amp               lt port gt  0-9   1-9  d  1-9  d 2   1-9  d 3   1-5  d 4  6 0-4  d 3  65 0-4  d 2  655 0-2  d 6553 0-5       x000D    return reg exec url  groups x000D    x000D   x000D  var url    https   192 168 1 1 1234  x000D  console log extractUrlInfo url   x000D  var url    https   stackoverflow com questions 8498592 extract-hostname-name-from-string  x000D  console log extractUrlInfo url   x000D   x000D   x000D

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String prototype trim   function   return his replace    s   s   g       function getHost url       if  undefined   typeof url   null  url  return         url   url trim    if     url  return         var  host  arr      if -1 lt url indexOf                   arr   url split                 if -1 lt  arr 0  indexOf       -1 lt  arr 0  indexOf       -1 lt  arr 0  indexOf        -1 lt  arr 0  indexOf    amp                   arr 0     arr 0  trim                if 0   arr 0  indexOf         host    arr 0  split       1  split      0  trim   split       0  split    amp    0               else return                       else               arr 1     arr 1  trim                 host    arr 1  split      0  trim   split       0  split    amp    0                       else          if 0  url indexOf         host   url split       1  split      0  trim   split       0  split    amp    0           else return               return  host    function getHostname url       if  undefined   typeof url   null  url  return         url   url trim    if     url  return         return getHost url  split      0     function getDomain url       if  undefined   typeof url   null  url  return         url   url trim    if     url  return         return getHostname url  replace    a-zA-Z0-9

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Okay  I know this is an old question  but I made a super-efficient url parser so I thought I d share it   As you can see  the structure of the function is very odd  but it s for efficiency  No prototype functions are used  the string doesn t get iterated more than once  and no character is processed more than necessary   function getDomain url        var dom       v  step   0      for var i 0 l url length  i lt l  i              v   url i   if step    0                  First  skip 0 to 5 characters ending in      ex   https                  if i  gt  5    i -1  step 1    else if v           i  2  step 1              else if step    1                  Skip 0 or 4 characters  www                  Note  Doesn t work with www com  but that domain isn t claimed anyway               if v     w   amp  amp  url i 1      w   amp  amp  url i 2      w   amp  amp  url i 3          i  4              dom  url i   step 2            else if step    2                  Stop at subpages  queries  and hashes              if v           v           v         break  dom    v                      return dom

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Code   var regex     w   com co  kr be  ig  var urls     http   www youtube com watch v ClkQA2Lb iE                http   youtu be ClkQA2Lb iE                http   www example com 12xy45                http   example com random        each urls  function index  url        var convertedUrl   url match regex       console log convertedUrl         Result   youtube com youtu be example com example com

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Well  doing using an regular expression will be a lot easier       mainUrl    http   www mywebsite com mypath to folder       urlParts         w                        exec mainUrl       host   Fragment 1      www mywebsite com

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If you end up on this page and you are looking for the best REGEX of URLS try this one       https                          https   regex101 com r pX5dL9 1  It works for urls without http      with http  with https  with just    and dont grab the path and query path as well   Good Luck

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function hostname url        var match   url match        www 0-9                i       if   match    null  amp  amp  match length  gt  2  amp  amp  typeof match 2       string   amp  amp  match 2  length  gt  0   return match 2          The above code will successfully parse the hostnames for the following example urls       http   WWW first com folder page html   first com      http   mail google com folder page html   mail google com      https   mail google com folder page html   mail google com      http   www2 somewhere com folder page html q 1   somewhere com      https   www another eu folder page html q 1   another eu   Original credit goes to  http   www primaryobjects com CMS Article145

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Parse-Urls appears to be the JavaScript library with the most robust patterns  Here is a rundown of the features   Chapter 1  Normalize or parse one URL  Chapter 2  Extract all URLs  Chapter 3  Extract URIs with certain names  Chapter 4  Extract all fuzzy URLs  Chapter 5  Highlight all URLs in texts  Chapter 6  Extract all URLs in raw HTML or XML

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oneline with jquery      lt a gt    attr  href   document location href  prop  hostname

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All url properties  no dependencies  no JQuery  easy to understand This solution gives your answer plus additional properties   No JQuery or other dependencies required  paste and go  Usage getUrlParts  quot https   news google com news headlines technology html ned us amp hl en quot    Output      quot origin quot    quot https   news google com quot      quot domain quot    quot news google com quot      quot subdomain quot    quot news quot      quot domainroot quot    quot google com quot      quot domainpath quot    quot news google com news headlines quot      quot tld quot    quot  com quot      quot path quot    quot news headlines technology html quot      quot query quot    quot ned us amp hl en quot      quot protocol quot    quot https quot      quot port quot   443     quot parts quot          quot news quot        quot google quot        quot com quot          quot segments quot          quot news quot        quot headlines quot        quot technology html quot          quot params quot                  quot key quot    quot ned quot          quot val quot    quot us quot                      quot key quot    quot hl quot          quot val quot    quot en quot               Code The code is designed to be easy to understand rather than super fast   It can be called easily 100 times per second  so it s great for front end or a few server usages  but not for high volume throughput  function getUrlParts fullyQualifiedUrl        var url               tempProtocol     var a   document createElement  a          if doesn t start with something like https    it s not a url  but try to work around that     if  fullyQualifiedUrl indexOf           -1            tempProtocol    https             a href   tempProtocol   fullyQualifiedUrl       else         a href   fullyQualifiedUrl     var parts   a hostname split          url origin   tempProtocol    quot  quot    a origin     url domain   a hostname     url subdomain   parts 0      url domainroot          url domainpath          url tld         parts parts length - 1      url path   a pathname substring 1      url query   a search substr 1      url protocol   tempProtocol    quot  quot    a protocol substr 0  a protocol length - 1      url port   tempProtocol    quot  quot    a port   a port   a protocol      http     80   a protocol      https     443   a port     url parts   parts     url segments   a pathname                a pathname split      slice 1      url params   url query               url query split   amp        for  var j   0  j  lt  url params length  j              var param   url params j           var keyval   param split              url params j                   key   keyval 0                val   keyval 1                         domainroot     if  parts length  gt  2            url domainroot   parts parts length - 2          parts parts length - 1              check for country code top level domain         if  parts parts length - 1  length    2  amp  amp  parts parts length - 1  length    2              url domainroot   parts parts length - 3          url domainroot               domainpath  domain path without filenames       if  url segments length  gt  0            var lastSegment   url segments url segments length - 1          var endsWithFile   lastSegment indexOf         -1         if  endsWithFile                var fileSegment   url path indexOf lastSegment              var pathNoFile   url path substr 0  fileSegment - 1              url domainpath   url domain             if  pathNoFile                  url domainpath   url domainpath         pathNoFile           else             url domainpath   url domain         url path       else         url domainpath   url domain     return url

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in short way you can do like this  var url    http   www someurl com support feature   function getDomain url     domain url split       1     return domain split      0     eg    getDomain  http   www example com page 1      output      www example com    Use above function to get domain name

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use this if you know you have a subdomain    www domain com - gt  domain com function getDomain       return window location hostname replace    a-zA-Z0-9

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Parsing a URL can be tricky because you can have port numbers and special chars  As such  I recommend using something like parseUri to do this for you  I doubt performance is going to be a issue unless you are parsing hundreds of URLs

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I recommend using the npm package psl  Public Suffix List   The  quot Public Suffix List quot  is a list of all valid domain suffixes and rules  not just Country Code Top-Level domains  but unicode characters as well that would be considered the root domain  i e  www       cn  b c kobe jp  etc    Read more about it here  Try  npm install --save psl  Then with my  quot extractHostname quot  implementation run  let psl   require  psl    let url    http   www youtube com watch v ClkQA2Lb iE   psl get extractHostname url       returns youtube com  I can t use an npm package  so below only tests extractHostname   x000D   x000D  function extractHostname url        var hostname        find  amp  remove protocol  http  ftp  etc   and get hostname      if  url indexOf        gt  -1            hostname   url split      2             else           hostname   url split      0                find  amp  remove port number     hostname   hostname split      0         find  amp  remove         hostname   hostname split      0        return hostname       test the code console log     Testing extractHostname        console log extractHostname  http   www blog classroom me uk index php     console log extractHostname  http   www youtube com watch v ClkQA2Lb iE     console log extractHostname  https   www youtube com watch v ClkQA2Lb iE     console log extractHostname  www youtube com watch v ClkQA2Lb iE     console log extractHostname  ftps   ftp websitename com dir file txt     console log extractHostname  websitename com 1234 dir file txt     console log extractHostname  ftps   websitename com 1234 dir file txt     console log extractHostname  example com param value     console log extractHostname  https   facebook github io jest      console log extractHostname    youtube com watch v ClkQA2Lb iE     console log extractHostname  http   localhost 4200 watch v ClkQA2Lb iE         Warning  you can use this function to extract the  root  domain  but it will not be as accurate as using the psl package   function extractRootDomain url        var domain   extractHostname url           splitArr   domain split               arrLen   splitArr length         extracting the root domain here       if there is a subdomain      if  arrLen  gt  2            domain   splitArr arrLen - 2          splitArr arrLen - 1             check to see if it s using a Country Code Top Level Domain  ccTLD   i e    me uk           if  splitArr arrLen - 2  length    2  amp  amp  splitArr arrLen - 1  length    2                  this is using a ccTLD             domain   splitArr arrLen - 3          domain                      return domain       test extractRootDomain console log     Testing extractRootDomain        console log extractRootDomain  http   www blog classroom me uk index php     console log extractRootDomain  http   www youtube com watch v ClkQA2Lb iE     console log extractRootDomain  https   www youtube com watch v ClkQA2Lb iE     console log extractRootDomain  www youtube com watch v ClkQA2Lb iE     console log extractRootDomain  ftps   ftp websitename com dir file txt     console log extractRootDomain  websitename co uk 1234 dir file txt     console log extractRootDomain  ftps   websitename com 1234 dir file txt     console log extractRootDomain  example com param value     console log extractRootDomain  https   facebook github io jest      console log extractRootDomain    youtube com watch v ClkQA2Lb iE     console log extractRootDomain  http   localhost 4200 watch v ClkQA2Lb iE     x000D   x000D   x000D   Regardless having the protocol or even port number  you can extract the domain  This is a very simplified  non-regex solution  so I think this will do   Thank you  Timmerz   renoirb   rineez   BigDong   ra00l   ILikeBeansTacos   CharlesRobertson for your suggestions   ross-allen  thank you for reporting the bug

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Try this   var matches   url match   https                              i   var domain   matches  amp  amp  matches 1       domain will be null if no match is found   If you want to exclude the port from your result  use this expression instead     https                                i   Edit  To prevent specific domains from matching  use a negative lookahead     youtube com     https             www       youtube  com youtu  be                           i

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import URL from  url    const pathname   URL parse url  path  console log url replace pathname          this takes care of both the protocol

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Was looking for a solution to this problem today   None of the above answers seemed to satisfy   I wanted a solution that could be a one liner  no conditional logic and nothing that had to be wrapped in a function   Here s what I came up with  seems to work really well    hostname  http   www example com 1234  hostname split       slice -1  0  split      0  split      slice -2  join           gives  example com    May look complicated at first glance  but it works pretty simply  the key is using  slice -n   in a couple of places where the good part has to be pulled from the end of the split array  and  0  to get from the front of the split array    Each of these tests return  example com      http   example com  split       slice -1  0  split      0  split      slice -2  join       http   example com 1234  split       slice -1  0  split      0  split      slice -2  join       http   www example com 1234  split       slice -1  0  split      0  split      slice -2  join       http   foo www example com 1234  split       slice -1  0  split      0  split      slice -2  join

[javascript] Extract hostname name from string

2020 answer

1. Use `URL.hostname` for readability

2. Use RegEx for performance

TL;DR

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