Get HTML page <input> values and names using regex on PHP

input, php, regex, xhtml

Solution

If you think I shouldn't use regex, but something like xpath, say how.

That would be something like

<?php
$doc = new DOMDocument;
if ( !$doc->loadhtml($contents) ) {
  echo 'something went wrong';
}
else {
  $xpath = new DOMXpath($doc);
  foreach($xpath->query('//form[@name="aspnetForm"]//input') as $eInput) {
      echo 'name=', $eInput->getAttribute('name'), ' value=', $eInput->getAttribute('value'), "\n";
  }
}

If you get annoying warning messages you might want to use @$doc->loadhtml($contents); maybe in conjuction with libxml_use_internal_errors() and libxml_get_errors()

Problem

Ok, so as the title says, I have an HTML page that I fetch using libcurl (cURL inside PHP). That page has one <form> that I need to extract the <input> names and values, and I would like to do that using Regex. I'm making it using Regex because I think that's the easier way. If you think I shouldn't use regex, but something like xpath, say how. I don't know if you can understand what I'm trying to say, so feel free to ask. Here's the PHP code (complete): ``` <?php /***** DISABLED BY NETWORK TRAFFIC REASONS... USING LOCAL CACHE $curl = curl_init(); $url = 'https://secure.optimus.pt/Particulares/Kanguru/Login/'; $useragent = 'Mozilla/5.0 (Windows; U; Windows NT 6.0; pt-PT; rv:1.9.1) Gecko/20090624 Firefox/3.5'; curl_setopt($curl,CURLOPT_URL,$url); curl_setopt($curl,CURLOPT_USERAGENT,$useragent); curl_setopt($curl,CURLOPT_SSL_VERIFYPEER,true); curl_setopt($curl,CURLOPT_SSL_VERIFYHOST,2); curl_setopt($curl,CURLOPT_CAINFO,getcwd()."\optimus_secure.crt"); curl_setopt($curl,CURLOPT_RETURNTRANSFER,true); $contents = curl_exec($curl); */ $contents = file_get_contents('local_secure.html'); preg_match('%<form name="aspnetForm" .*? action="(.*?)" .*?>(.*?)</form>%s',$contents,$matches); //echo '<pre>'.htmlentities($contents).'</pre>'; //array_shift($matches); echo '<pre>---------'; foreach($matches as $match) echo '$match:::::: '.htmlentities($match)."\r\n\r\n"; echo '</pre>'; echo '<pre>__________'; preg_match_all('/<input type=".*?" name="(.*?)" value="(.*?)" \/>/', $matches[0], $matches2); print_r($matches2); echo '</pre>'; ?> ``` Of course that the <pre> tags and all that output is just for debugging. Also, here's the source code of the HTML page (the part that matters): ``` <form name="aspnetForm" method="post" action="../Login?OptimusChannelID=D5774383-A407-42E9-A0AD-4838C97AB162&amp;OptimusContentID=&amp;OptimusSelectedSiteID=B33E7D52-8738-4756-A25D-B907D1823B71&amp;OptimusSelectedAreaID=AF8E0BDF-17E3-4438-9FA9-D53A13A508D8&amp;OptimusSelectedLocalID=D5774383-A407-42E9-A0AD-4838C97AB162" onsubmit="javascript:return WebForm_OnSubmit();" id="aspnetForm"> <div> <input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" /> <input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" /> <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUKLTc4MzE4NTQyNQ9kFgJmD2QWBgIID2QWAgIBD2QWBGYPZBYCAgMPDxYEHhRWYWxpZGF0aW9uRXhwcmVzc2lvbgUCLioeB0VuYWJsZWRoZGQCAQ9kFgICBQ8PFgIeBFRleHQFKk8gY2FtcG8gRW1haWwgJmVhY3V0ZTsgb2JyaWdhdCZvYWN1dGU7cmlvIWRkAgkPZBYCAgEPFgIfAmVkAgoPDxYCHgdWaXNpYmxlaGRkGAEFHl9fQ29udHJvbHNSZXF1aXJlUG9zdEJhY2tLZXlfXxYCBSVjdGwwMCRNYWluQ29udGVudFBsYWNlSG9sZGVyJEltZ0xvZ2luBSxjdGwwMCRNYWluQ29udGVudFBsYWNlSG9sZGVyJGltZ0J0blJlY3VwZXJhcorZDETv8JCxlvTojv3w53/dbo9m" /> </div> <script type="text/javascript">....</script> <script src="..." type="text/javascript"></script> <script src="..." type="text/javascript"></script> <script type="text/javascript">...</script> <div class="row_container"> <div class="titulo_barra rosa laranja_empresas"> LOGIN<br/> </div> <div class="PanelLogin"> <div class="Mensagem"> <div class="texto"> Para aceder, por favor, fa&ccedil;a login. </div> </div> <div id="ctl00_MainContentPlaceHolder_PanelLogin" onkeypress="javascript:return WebForm_FireDefaultButton(event, 'ctl00_MainContentPlaceHolder_ImgLogin')"> <div class="Mensagem"> <div> <label for="telem"> User<span id="ctl00_MainContentPlaceHolder_UsernameValidator" style="color:Red;display:none;"></span> </label> <input name="ctl00$MainContentPlaceHolder$TxtUsername" type="text" id="ctl00_MainContentPlaceHolder_TxtUsername" class="text" maxlength="255" /> <label style="padding-left: 10px" for="password"> Password <span id="ctl00_MainContentPlaceHolder_RequiredPasswordValidator" style="color:Red;display:none;"></span><span id="ctl00_MainContentPlaceHolder_UsernameRegexValidator" style="color:Red;display:none;"></span> </label> <input name="ctl00$MainContentPlaceHolder$TxtPassword" type="password" id="ctl00_MainContentPlaceHolder_TxtPassword" class="text" maxlength="5" /> <input type="hidden" name="fromssl" value="" /> <input type="image" name="ctl00$MainContentPlaceHolder$ImgLogin" id="ctl00_MainContentPlaceHolder_ImgLogin" src="/img/btn_password.gif" alt="Login" onclick="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(&quot;ctl00$MainContentPlaceHolder$ImgLogin&quot;, &quot;&quot;, true, &quot;&quot;, &quot;&quot;, false, false))" style="border-width:0px;position: absolute; padding-left: 5px " /><br /> </div> <div id="login_error_box"> <div id="ctl00_MainContentPlaceHolder_ValidationSummary1" class="error" style="color:#FF6000;display:none;"> </div> </div> </div> </div> </div> <div class="titulo_barra rosa laranja_empresas"> RECUPERA&Ccedil;&Atilde;O DE PASSWORD </div> <div class="PanelLogin"> <div class="Mensagem"> <div class="texto"> Para recuperar a sua password introduza o seu e-mail. Se pretender recuperar o seu username utilize o link abaixo </div> </div> <div id="ctl00_MainContentPlaceHolder_Panel1" onkeypress="javascript:return WebForm_FireDefaultButton(event, 'ctl00_MainContentPlaceHolder_imgBtnRecuperar')"> <div class="Mensagem"> <div id="Div1"> <label for="telem"> Email</label> <input name="ctl00$MainContentPlaceHolder$txtEmailHabitual" type="text" id="ctl00_MainContentPlaceHolder_txtEmailHabitual" class="text" maxlength="255" /> <input type="image" name="ctl00$MainContentPlaceHolder$imgBtnRecuperar" id="ctl00_MainContentPlaceHolder_imgBtnRecuperar" class="img rosa azul_empresas" src="/img/bot_recuperar.gif" alt="Recuperar" onclick="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(&quot;ctl00$MainContentPlaceHolder$imgBtnRecuperar&quot;, &quot;&quot;, true, &quot;email&quot;, &quot;&quot;, false, false))" style="border-width:0px;margin-top: -2px; position: absolute;" /> <br /> <span id="ctl00_MainContentPlaceHolder_EmailValidator" class="error" style="color:Red;display:none;">O campo Email &eacute; obrigat&oacute;rio!</span> <span id="ctl00_MainContentPlaceHolder_EmailRegularExpressionValidator" style="color:Red;display:none;"> Formato do Email inválido.</span> </div> <div class="Mensagem" CssClass="error" DisplayMode="SingleParagraph" ForeColor="#FF6000"> </div> <a id="ctl00_MainContentPlaceHolder_lnkRecuser" href="javascript:__doPostBack('ctl00$MainContentPlaceHolder$lnkRecuser','')"> <div align="left" style="color:#FF7000" class="footerButtonsOrange">Recuperar username</div> </a> </div> </div> </div> </div> <script type="text/javascript">...</script> <script type="text/javascript">...</script> <script type="text/javascript">...</script> <div> <input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWBwKQ08lZAqmxyPwLAvCnm8wMAt/Wt8sGAv2svvMEAtCB5oUIAr6ar9wLz+9apOkY23Vs+vCYNJuK2ug3Gm0=" /> </div> <script type="text/javascript">...</script> </form> ``` Also, sorry for the low readability of the source code. If you want, I can try to indent it better. Thank you, Pedro Cunha EDIT: Thank you all for your help. All the answers worked flawlessly, however I chose VolkerK's response, because since it is an HTML page, elements may be nested, and I know (of the few things that I know about XPath) that // is a wildcard.

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