Regex To Return All Attributes Of A Web Page That Starts By A Specific Value December 27, 2023 Post a Comment The question is simple, I need to get the value of all attributes whose value starts withhttp://example.com/api/v3?. For example, if a page contains twitter</code> attribute in your example. This means you'll have to iterate over all the attributes on a given element.</p><p>With out a global attribute value selector, you will need to manually iterate over all elements and values. It may be possible for you to determine some heuristics to help narrow down your search before going brute force.</p><a name='more'></a></div><h2 id="solution_2">Solution 2: </h2><div class="answer-desc"><p>A regular expression would likely look like this:</p><pre><code id="code_2" class="hljs language-bash">/http:\/\/example\.com\/api\/v3\?\S+/g </code><button class="copy-btn btn btn-secondary btn-sm" onclick="copyCode(this,'code_2')">Copy</button></pre><p>Make sure to escape each <code>/</code> and <code>?</code> with a backslash. <code>\S+</code> yields all subsequent non-space characters. You can also try <code>[^\s"]+</code> instead of <code>\S</code> if you also want to exclude quote marks.</p><p>In my experience, though, regexes are usually slower than working on already parsed objects directly, so I’d recommend you try these <code>Array</code> and DOM functions instead:</p><p>Get all elements, map them to their attributes and filter those that start with <code>http://example.com/api/v3?</code>, reduce all attributes lists to one Array and map those attributes to their values.</p><pre><code id="code_10" class="hljs language-javascript"><span class="hljs-title class_">Array</span>.<span class="hljs-title function_">from</span>(<span class="hljs-variable language_">document</span>.<span class="hljs-title function_">querySelectorAll</span>(<span class="hljs-string">"*"</span>)) .<span class="hljs-title function_">map</span>(<span class="hljs-function"><span class="hljs-params">elem</span> =></span><span class="hljs-title class_">Object</span>.<span class="hljs-title function_">values</span>(elem.<span class="hljs-property">attributes</span>) .<span class="hljs-title function_">filter</span>(<span class="hljs-function"><span class="hljs-params">attr</span> =></span> attr.<span class="hljs-property">value</span>.<span class="hljs-title function_">startsWith</span>(<span class="hljs-string">"http://example.com/api/v3?"</span>))) .<span class="hljs-title function_">reduce</span>(<span class="hljs-function">(<span class="hljs-params">list, attrList</span>) =></span> list.<span class="hljs-title function_">concat</span>(attrList), []) .<span class="hljs-title function_">map</span>(<span class="hljs-function"><span class="hljs-params">attr</span> =></span> attr.<span class="hljs-property">value</span>); </code><button class="copy-btn btn btn-secondary btn-sm" onclick="copyCode(this,'code_10')">Copy</button></pre><p>You can find polyfills for ES6 and ES5 functions and can use Babel or related tools to convert the code to ES5 (or replace the arrow functions by hand).</p></div> </div> <div id='baca-juga'></div> <script> //<![CDATA[ var bacaJugaJudul=[],bacaJugaNum=0,bacaJugaUrl=[];function bacaJuga(a){for(var u=0;u<a.feed.entry.length;u++){var e=a.feed.entry[u];bacaJugaJudul[bacaJugaNum]=e.title.$t;for(var l=0;l<e.link.length;l++)if("alternate"==e.link[l].rel){bacaJugaUrl[bacaJugaNum]=e.link[l].href,bacaJugaNum++;break}}}function showBacaJuga(a){function u(a,u){u.parentNode.insertBefore(a,u.nextSibling)}var e=document.querySelector("#baca-juga"),l=document.createElement("div"),t=document.querySelector(".post-body-artikel").querySelectorAll("div > br, span > br, div > p, span > p"),r=Math.ceil(.5*t.length),n=document.getElementById("related"),c=(l.setAttribute("class","baca-juga-wrap"),{bacaJuga:!0,jumlahBacaJuga:3,judulBacaJuga:"Baca Juga"});optionLinkMagz(c);if(!0===c.bacaJuga&&void 0!==t[r]){u(e,null!==n?n:t[r]);for(var g=0;g<bacaJugaUrl.length;g++)bacaJugaUrl[g]==a&&(bacaJugaUrl.splice(g,1),bacaJugaJudul.splice(g,1));var J=Math.floor((bacaJugaJudul.length-1)*Math.random()),g=0;if(0<bacaJugaJudul.length&&0<c.jumlahBacaJuga){e.appendChild(l);n=e;null!=(n=n.previousElementSibling)&&"BR"===n.tagName&&(n.style.display="none");for(var i="<strong>"+c.judulBacaJuga+"</strong><ul>";g<bacaJugaJudul.length&&g<c.jumlahBacaJuga;g++)i+='<li><a href="'+bacaJugaUrl[J]+'">'+bacaJugaJudul[J]+"</a></li>",J<bacaJugaJudul.length-1?J++:J=0;l.innerHTML=i+="</ul>"}}} //]]> </script> <script src='/feeds/posts/summary/-/Html?alt=json-in-script&callback=bacaJuga&max-results=5'></script> <script src='/feeds/posts/summary/-/Javascript?alt=json-in-script&callback=bacaJuga&max-results=5'></script> <script src='/feeds/posts/summary/-/Regex?alt=json-in-script&callback=bacaJuga&max-results=5'></script> <script src='/feeds/posts/summary/-/Userscripts?alt=json-in-script&callback=bacaJuga&max-results=5'></script> <script> showBacaJuga("https://portablemicrocassetterecordersdigital.blogspot.com/2023/12/regex-to-return-all-attributes-of-web.html"); 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