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Run results for:
local vs global regex performance in js functions (v2)
Do regular expressions become faster in javascript, when we put them in the global scope, or doesn't it matter when we declare them directly in a function?
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<iframe src="https://measurethat.net/Embed?id=591738" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Browser:
Chrome 134
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
regex in global scope
22K/s
regex directly in function
21K/s
View exact numbers
Test name
Executions per second
✓
regex in global scope
21,681 Ops/sec
regex directly in function
21,080 Ops/sec
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href="Status.html">More Open Source Software</a></li> <li><a title="Open Web Platform testing" href="https://web-platform-tests.org/">Web Platform Tests</a></li> <li><a title="MOOCs from W3C on edX" href="https://www.edx.org/school/w3cx">W3Cx (Training)</a></li> </ul> </div> <div class="w3c_mainCol"> <div id="w3c_crumbs"> <div id="w3c_crumbs_frame"> <p class="bct"><span class="skip"><a tabindex="1" accesskey="2" title="Skip to content (e.g., when browsing via audio)" href="#w3c_most-recently">Skip</a></span></p> <br /></div> </div> <div class="line"> <div class="unit size2on3"> <div class="main-content"> <h2 class="offscreen">News</h2> <div id="w3c_slideshow"><div id="w3c_most-recently" class="intro hierarchy vevent_list"> <div class="event w3c_topstory expand_block"> <div class="headline"> <h3 class="h4 tPadding0 bPadding0 summary"> <span class="expand_section">W3C opens Technical Architecture Group (TAG) election</span> </h3> <p class="date"> <span class="dtstart published" title="2021-11-16T09:54:48Z"> 16 November 2021 </span> | <a title="Archive: W3C opens Technical Architecture Group (TAG) election" href="https://www.w3.org/blog/news/archives/9338">Archive</a> </p> </div> <div class="description expand_description"><p><a class="imageLink" href="https://www.w3.org/2021/11/16-tag-nominations"><img loading="lazy" src="https://www.w3.org/blog/news/files/2017/12/w3c-tag-300x300.jpg" alt="W3C TAG logo" width="80" height="80" /></a>The W3C Advisory Committee, having <a href="https://www.w3.org/2021/11/16-tag-nominations">nominated</a> four individuals, is invited today to vote until 14 December 2021 for <strong>three seats</strong> in the <a href="https://www.w3.org/2001/tag/">W3C Technical Architecture Group (TAG)</a> election.</p> <p>The TAG is a special working group within the W3C, chartered under the <a href="https://www.w3.org/Consortium/Process/#TAG">W3C Process Document</a>, with stewardship of the Web architecture. Some aspects of its mission include</p> <ul class="show_items"> <li>to document and build consensus around principles of Web architecture and to interpret and clarify these principles when necessary;</li> <li>to resolve issues involving general Web architecture brought to the TAG;</li> <li>to help coordinate cross-technology architecture developments inside and outside W3C.</li> </ul> </div> </div> <div class="event w3c_topstory expand_block"> <div class="headline"> <h3 class="h4 tPadding0 bPadding0 summary"> <span class="expand_section">Job: Automotive and Transportation Champion (USA, China, Japan)</span> </h3> <p class="date"> <span class="dtstart published" title="2021-11-15T13:23:14Z"> 15 November 2021 </span> | <a title="Archive: Job: Automotive and Transportation Champion (USA, China, Japan)" href="https://www.w3.org/blog/news/archives/9330">Archive</a> </p> </div> <div class="description expand_description"><p><a class="imageLink" href="https://www.w3.org/Consortium/Recruitment/#2021-automotive-champion"><img src="https://www.w3.org/comm/assets/icons/handshake.png" alt="handshake" width="100" /></a>We are excited to announce an open position (possibly part-time) : <a href="https://www.w3.org/Consortium/Recruitment/#2021-automotive-champion">Automotive & Transportation Champion</a>, based in the USA or China, or Japan.</p> <p>This is an opportunity for a global leader to drive the overall strategy of applying open web standards to the automotive & transportation ecosystem. The Champion is a thought leader who has a deep understanding of the needs of the automotive industry and a working understanding of web technology. The Champion engages with other automotive thought leaders from W3C Members and with technologists in W3C. By bringing these groups together, the Champion identifies new technology needs for the industry and identifies technical and business approaches to satisfy those needs.</p> </div> </div> <div class="event closed expand_block"> <div class="headline"> <h3 class="h4 tPadding0 bPadding0 summary"> <span class="expand_section">Authorized Translation of WCAG 2.1 in Arabic</span> </h3> <p class="date"> <span class="dtstart published" title="2021-11-12T00:12:08Z"> 12 November 2021 </span> | <a title="Archive: Authorized Translation of WCAG 2.1 in Arabic" href="https://www.w3.org/blog/news/archives/9327">Archive</a> </p> </div> <div class="description expand_description"><p><a class="imageLink" href="https://www.w3.org/TR/WCAG21/"><img style="float: left;margin-right: 1em" src="https://www.w3.org/WAI/images/WCAG21/small-1024x512@1x.png" alt="Screenshot showing the w3c logo and the title of the W3C WCAG 2.1 Web Content Accessibility Guidelines" width="150" /></a>The World Wide Web Consortium published the Authorized Arabic Translation of <a href="https://www.w3.org/TR/2018/REC-WCAG21-20180605/">Web Content Accessibility Guidelines (WCAG) 2.1</a>, <a href="https://www.w3.org/Translations/WCAG21-ar/">مبادئ النفاذ إلى محتوى الويب (WCAG2.1)</a>. The Lead Translation Organization for this Authorized Translation was the <a href="https://www.mada.org.qa">Mada Center, Qatar</a>.</p> <p>Translations in other languages are listed in <a href="https://www.w3.org/WAI/standards-guidelines/wcag/translations/">WCAG 2 Translations</a>. W3C Web Accessibility Initiative (<a href="https://www.w3.org/WAI/">WAI</a>) particularly encourages the development of Authorized Translations of WCAG 2.1 and other technical specifications to facilitate their adoption and implementation internationally. Read about the <a href="https://www.w3.org/2005/02/TranslationPolicy">Policy for W3C Authorized Translations</a>.</p> </div> </div> <div class="event closed expand_block"> <div class="headline"> <h3 class="h4 tPadding0 bPadding0 summary"> <span class="expand_section">Last Call for Review of Proposed Corrections: Verifiable Credentials Data Model v1.1 Recommendation</span> </h3> <p class="date"> <span class="dtstart published" title="2021-11-09T12:47:05Z"> 9 November 2021 </span> | <a title="Archive: Last Call for Review of Proposed Corrections: Verifiable Credentials Data Model v1.1 Recommendation" href="https://www.w3.org/blog/news/archives/9324">Archive</a> </p> </div> <div class="description expand_description"><p>The <a href="https://www.w3.org/groups/wg/vc">Verifiable Credentials Working Group</a> has proposed corrections to the W3C Recommendation of <a href="https://www.w3.org/TR/2021/REC-vc-data-model-20211109/">Verifiable Credentials Data Model v1.1</a>. <a href="https://www.w3.org/TR/2021/REC-vc-data-model-20211109/#dfn-credential">Credentials</a> are a part of our daily lives; driver’s licenses are used to assert that we are capable of operating a motor vehicle, university degrees can be used to assert our level of education, and government-issued passports enable us to travel between countries. This specification provides a mechanism to express these sorts of credentials on the Web in a way that is cryptographically secure, privacy respecting, and machine-verifiable.</p> <p>Comments, including implementation experience, are welcome via <a href="https://github.com/w3c/vc-data-model/issues/">GitHub</a> through <strong>18 January 2022</strong>.</p> </div> </div> <div class="event closed expand_block"> <div class="headline"> <h3 class="h4 tPadding0 bPadding0 summary"> <span class="expand_section">First Public Working Draft: IMSC Hypothetical Render Model</span> </h3> <p class="date"> <span class="dtstart published" title="2021-11-09T08:10:33Z"> 9 November 2021 </span> | <a title="Archive: First Public Working Draft: IMSC Hypothetical Render Model" href="https://www.w3.org/blog/news/archives/9318">Archive</a> </p> </div> <div class="description expand_description"><p><a class="imageLink" href="https://www.w3.org/blog/2021/08/keeping-the-complexity-of-imsc-documents-under-control/"><img src="https://www.w3.org/blog/news/files/2021/11/139459388-f7a9b2cc-8152-46e6-806b-9870bb6331e6.png" alt="image of IMSC DOCUMENT COMPLEXITY" width="100" /></a>The <a href="https://www.w3.org/groups/wg/timed-text">Timed Text Working Group</a> has published a First Public Working Draft of <a href="https://www.w3.org/TR/2021/WD-imsc-hrm-20211109/">IMSC Hypothetical Render Model</a>. This specification specifies an Hypothetical Render Model (HRM) that measures the complexity of caption and subtitle documents that conform to the <a href="https://www.w3.org/TR/ttml-imsc/">IMSC Recommendation</a>, so that they do not overload players. For more information, see the blog post <a href="https://www.w3.org/blog/2021/08/keeping-the-complexity-of-imsc-documents-under-control/">Keeping the complexity of IMSC documents under control</a>.</p> </div> </div> <div class="event closed expand_block"> <div class="headline"> <h3 class="h4 tPadding0 bPadding0 summary"> <span class="expand_section">Working Group Note: EPUB 3 Structural Semantics Vocabulary 1.1</span> </h3> <p class="date"> <span class="dtstart published" title="2021-11-04T07:50:32Z"> 4 November 2021 </span> | <a title="Archive: Working Group Note: EPUB 3 Structural Semantics Vocabulary 1.1" href="https://www.w3.org/blog/news/archives/9307">Archive</a> </p> </div> <div class="description expand_description"><p>The <a href="https://www.w3.org//publishing/groups/epub-wg/">EPUB 3 Working Group</a> has just published the Working Group Note of <a href="https://www.w3.org/TR/2021/NOTE-epub-ssv-11-20211104/">EPUB 3 Structural Semantics Vocabulary 1.1</a>. This vocabulary, a part of EPUB 3, defines a set of properties relating to the description of structural semantics of written works.</p> <p>Structural semantics add additional meaning about the specific structural purpose an HTML (or SVG) element plays. The <code>epub:type</code> attribute, defined in EPUB 3.3, is used to express domain-specific semantics in EPUB Content Documents and Media Overlay Documents, with the structural information it carries complementing the underlying vocabulary. The applied semantics refine the meaning of their containing elements without changing their nature for assistive technologies, as happens when using the similar <code>role</code> attribute in HTML. The attribute does not enhance the accessibility of the content, in other words, only provides hints about the purpose. This documents defines the default vocabulary that can be used with the <code>epub:type</code> attribute.</p> </div> </div> <div class="event closed expand_block"> <div class="headline"> <h3 class="h4 tPadding0 bPadding0 summary"> <span class="expand_section">W3C updates its Process Document</span> </h3> <p class="date"> <span class="dtstart published" title="2021-11-02T12:18:30Z"> 2 November 2021 </span> | <a title="Archive: W3C updates its Process Document" href="https://www.w3.org/blog/news/archives/9313">Archive</a> </p> </div> <div class="description expand_description"><p><a class="imageLink" href="https://www.w3.org/2021/Process-20211102/"><img src="https://www.w3.org/comm/assets/icons/megaphone.png" alt="megaphone" width="100" /></a>The W3C Membership approved the <a href="https://www.w3.org/2021/Process-20211102/">2 November 2021 W3C Process Document</a>, which takes effect today.</p> <p>Notable changes include:</p> <ul class="show_items"> <li>Registries Track: Introduced a specialized track for maintaining Registries at W3C.</li> <li>W3C Statements: Notes endorsed by W3C as a whole, through an Advisory Committee Review.</li> <li>TAG and AB Publications: The W3C Technical Architecture Group (TAG) and Advisory Board (AB) are now allowed to publish Notes.</li> <li>Track Separation: Recommendations, Notes+Statements, Registries are on separated publication tracks to make it easier to know what the intended end-state of a document might be.</li> <li>Tooling Policy: Defined guidelines for the tools that groups use for publication and collaboration, to ensure long-lived access to W3C publications, and to enable access and effective participation by anyone.</li> </ul> <p>You can read more about <a href="https://www.w3.org/2021/Process-20211102/#changes-2020">all changes</a> since the 15 September 2020 Process Document, read the <a href="https://www.w3.org/Consortium/Process/Drafts/issues-20210603">complete disposition of comments</a>, or peruse the <a href="https://services.w3.org/htmldiff?doc1=https%3A%2F%2Fwww.w3.org%2FConsortium%2FProcess%2FDrafts%2Fsnapshots%2F2021-07-16&doc2=https%3A%2F%2Fwww.w3.org%2F2021%2FProcess-20211102%2F">diff</a>.</p> <p>This document was developed between the <a href="/2002/ab/">W3C Advisory Board</a> and the public <a href="/community/w3process">Revising W3C Process Community Group</a>. Comments and feedback on the new Process Document may be sent as issues in the <a href="https://github.com/w3c/w3process/issues">public GitHub Repository</a>.</p> </div> </div> <div class="event closed expand_block"> <div class="headline"> <h3 class="h4 tPadding0 bPadding0 summary"> <span class="expand_section">W3C Strategic Highlights, October 2021</span> </h3> <p class="date"> <span class="dtstart published" title="2021-10-19T13:11:51Z"> 19 October 2021 </span> | <a title="Archive: W3C Strategic Highlights, October 2021" href="https://www.w3.org/blog/news/archives/9295">Archive</a> </p> </div> <div class="description expand_description"><p><a class="imageLink" href="https://www.w3.org/2021/10/TPAC/Overview.html"><img src="https://www.w3.org/comm/assets/icons/megaphone.png" alt="megaphone" width="100" /></a>W3C released today to the public the October 2021 edition of the <a href="https://www.w3.org/2021/10/w3c-highlights/Overview.html">W3C Strategic Highlights</a>. This report highlights recent work W3C Members and the public do at the Web Consortium to enhance the Web platform, work towards its growth and strength so that the web remains a tool that has and will continue to accelerate scientific cooperation and discoveries, a social means to bridge families and friends, a way to learn online and grow skills, an instrument to conduct successful business, and much more.</p> <p>You will find in this semi-annual report updates in key areas that are core to the Web platform, but also how W3C meets the needs of industry and society as a whole, how the future of Web standards is determined, and the latest information on Web for all and outreach to the world.</p> </div> </div> </div></div> <p class="noprint"><span class="more-news"><a href="/blog/news/" title="More News">More news…</a> <a title="RSS feed for W3C home page news" href="/blog/news/feed" class="feedlink"><img width="30" height="30" alt="RSS" src="/2008/site/images/icons/rss30" /></a> <a title="Atom feed for W3C home page news" href="/blog/news/feed/atom" class="feedlink"><img width="30" height="30" alt="Atom" src="/2008/site/images/icons/atom30" /></a></span></p> <div class="w3c_events_talks"> <div class="line"> <div class="unit size1on2"> <div id="w3c_home_talks" class="w3c_upcoming_talks"><div> <h2 class="category"> <a title="More Talks…" href="/Talks/"> Talks and Appearances <img src="/2008/site/images/header-link" alt="Header link" width="13" height="13" class="header-link" /> </a> </h2> <ul class="vevent_list"> <li class="vevent"> <p class="date single"> <span class="dtstart"> <span class="year">2021</span><span class="mm-dd">-11-30</span> </span> <span class="paren">(</span><span class="dd-mmm">30 NOV</span><span class="paren">)</span> </p> <div class="info-wrap"> <p class="summary"><a href="https://www.w3.org/blog/talks/event/live-panel-iot-security-acting-ahead-of-the-threat/" rel="bookmark">live panel: IoT Security – Acting Ahead of the Threat</a></p> <p class="source"> by Michael McCool, Intel </p> <p class="eventtitle"> <a href="https://www.w3.org/blog/talks/venue/iot-techexpo-europe-2021-virtual-show/" title="IoT TechExpo Europe 2021 (virtual show)">IoT TechExpo Europe 2021 (virtual show)</a> </p> </div> </li> </ul> </div></div> </div> <div class="unit size1on2 lastUnit"> <div id="w3c_home_upcoming_events" class="w3c_upcoming_events"><h2 class="category"><a title="More Events…" href="/participate/eventscal.html">Events <img src="/2008/site/images/header-link" alt="Header link" width="13" height="13" class="header-link" /></a></h2> <ul class="vevent_list"> <li class="vevent"> <div class="date"> <span class="dtstart"><span class="year">2021</span><span class="mm-dd">-11-23</span></span> <span class="paren">(</span><span class="dd-mmm">23 NOV</span><span class="paren">)</span> <span class="date-separator"> – </span> <span class="dtend"><span class="year">2021</span><span class="mm-dd">-11-24</span></span> <span class="paren">(</span><span class="dd-mmm">24 NOV</span><span class="paren">)</span> </div> <div class="info-wrap"> <p class="summary"> <a href="https://www.techexevent.com/techex-europe/" class="uri url">TechEx Europe 2021</a> </p> <p class="location">Amsterdam, NL </p> </div> </li> <li class="vevent"> <div class="date"> <span class="dtstart"><span class="year">2021</span><span class="mm-dd">-11-30</span></span> <span class="paren">(</span><span class="dd-mmm">30 NOV</span><span class="paren">)</span> <span class="date-separator"> – </span> <span class="dtend"><span class="year">2021</span><span class="mm-dd">-12-01</span></span> <span class="paren">(</span><span class="dd-mmm"> 1 DEC</span><span class="paren">)</span> </div> <div class="info-wrap"> <p class="summary"> <a href="https://www.iottechexpo.com/europe/speaker/michael-mccool/" class="uri url">IoT TechExpo Europe 2021 (virtual show)</a> </p> <p class="location">(online event)</p> </div> </li> </ul></div> </div> </div> </div> <!-- end events talks --></div> <!-- end main content --></div> <div class="unit size1on3 lastUnit"> <h2 class="category"><a href="/Consortium/">About W3C <img src="/2008/site/images/header-link.gif" alt="Header link" width="13" height="13" class="header-link" /></a></h2> <p class="about">The World Wide Web Consortium (W3C) is an <a href="/Consortium/facts">international community</a> that develops open <a href="/TR/">standards</a> to ensure the long-term growth of the Web.</p> <h2 class="category"><a href="support/">Donations <img src="/2008/site/images/header-link.gif" alt="Header link" width="13" height="13" class="header-link" /></a></h2> <p class="about">Become a <a href="support/">Friend of W3C</a>: support the <a href="Consortium/mission">W3C mission</a> and free <a href="/developers/">developer tools</a>.</p> <div id="w3c_home_recent_blogs"><h2 class="category"> <a title="More Blog Entries…" href="/blog/">W3C Blog <img src="/2008/site/images/header-link" alt="Header link" width="13" height="13" class="header-link" /> </a> </h2><ul class="hentry_list"> <li class="hentry"> <p class="entry-title"> <a href="https://www.w3.org/blog/2021/10/w3c-co-signs-the-global-encryption-day-statement/" class="uri url" rel="bookmark">W3C co-signs the Global Encryption Day Statement</a> </p> <p class="date"> <abbr title="2021-10-21" class="published">21 October 2021</abbr> by <span class="author vcard">Wendy Seltzer</span> </p> </li> <li class="hentry"> <p class="entry-title"> <a href="https://www.w3.org/blog/2021/10/accessibility-of-remote-meetings-call-for-review/" class="uri url" rel="bookmark">Accessibility of Remote Meetings – call for review</a> </p> <p class="date"> <abbr title="2021-10-20" class="published">20 October 2021</abbr> by <span class="author vcard">Joshue O Connor</span> </p> </li> <li class="hentry"> <p class="entry-title"> <a href="https://www.w3.org/blog/2021/10/natural-language-interface-accessibility-user-requirements-call-for-review/" class="uri 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Script Preparation code:
window.RE_A_TAGS = /<a(?:\s[^>]*)?\shref\s*=\s*["']([^"']+)["'][^>]*>(.*?)<\/a(?:\s[^>]*)?>/igs; window.html = window.document.documentElement.outerHTML; function a(){ const RE_A_TAGS = /<a(?:\s[^>]*)?\shref\s*=\s*["']([^"']+)["'][^>]*>(.*?)<\/a(?:\s[^>]*)?>/igs, a_tags = window.html.matchAll(RE_A_TAGS), links = []; for(const a of a_tags){ links.push({ url: a[1].trim(), anchortext: a[2].trim() }); } return links; } function b(){ const a_tags = window.html.matchAll(window.RE_A_TAGS), links = []; for(const a of a_tags){ links.push({ url: a[1].trim(), anchortext: a[2].trim() }); } return links; }
Tests:
regex directly in function
const links = a(); console.log(links.length);
regex in global scope
const links = b(); console.log(links.length);