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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Regex Challenge - Week Fourteen</title>
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<link rel="stylesheet" href="assets/style.css">
</head>
<body>
<header>
<h1>Regex Tuesday Challenge - Week Fourteen</h1>
<nav>
<a href="./">« View all Challenges</a>
</nav>
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<a href="https://twitter.com/share" class="twitter-share-button" data-via="callumacrae" data-hashtags="regextuesday">Tweet</a>
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<p>This challenge, suggested by <a href="http://www.reddit.com/user/a-t-k">/u/a-t-k</a>, is to match all the valid chemical element short names (eg. H and Ag) of elements <strong>with an atomic number of 50 or less</strong>. This is golf; the aim is to create the shortest regular expression possible. You should match the chemical formulas, and nothing else.</p>
<p>To test a regular expression on the test cases below, type it into the text input. Each test case will be marked as passed or failed respectively - you are aiming to get as many test cases as you can to pass. Note that JavaScript must be enabled for this feature to work. The regex engine used is the JavaScript regex engine; it is similar to PCRE, but with a few differences.</p>
<p class='single-input'>
<textarea id="find" placeholder="/regexp? here/i"></textarea>
</p>
<h3>Test cases (<span id='passed-count'>0</span>/101) <a id='permalink' class='button' href='./challenge14.html'>Permalink</a> <label id="hide_passing"><input type="checkbox"> Hide passing tests</label></h3>
<dl id='tests'>
<dt>H</dt><dd>match</dd>
<dt>He</dt><dd>match</dd>
<dt>Li</dt><dd>match</dd>
<dt>Be</dt><dd>match</dd>
<dt>B</dt><dd>match</dd>
<dt>C</dt><dd>match</dd>
<dt>N</dt><dd>match</dd>
<dt>O</dt><dd>match</dd>
<dt>F</dt><dd>match</dd>
<dt>Ne</dt><dd>match</dd>
<dt>Na</dt><dd>match</dd>
<dt>Mg</dt><dd>match</dd>
<dt>Ni</dt><dd>match</dd>
<dt>Si</dt><dd>match</dd>
<dt>P</dt><dd>match</dd>
<dt>S</dt><dd>match</dd>
<dt>Cl</dt><dd>match</dd>
<dt>Ar</dt><dd>match</dd>
<dt>K</dt><dd>match</dd>
<dt>Ca</dt><dd>match</dd>
<dt>Sc</dt><dd>match</dd>
<dt>Ti</dt><dd>match</dd>
<dt>V</dt><dd>match</dd>
<dt>Cr</dt><dd>match</dd>
<dt>Mn</dt><dd>match</dd>
<dt>Fe</dt><dd>match</dd>
<dt>Co</dt><dd>match</dd>
<dt>Ni</dt><dd>match</dd>
<dt>Cu</dt><dd>match</dd>
<dt>Zn</dt><dd>match</dd>
<dt>Ga</dt><dd>match</dd>
<dt>Ge</dt><dd>match</dd>
<dt>As</dt><dd>match</dd>
<dt>Se</dt><dd>match</dd>
<dt>Br</dt><dd>match</dd>
<dt>Kr</dt><dd>match</dd>
<dt>Rb</dt><dd>match</dd>
<dt>Sr</dt><dd>match</dd>
<dt>Y</dt><dd>match</dd>
<dt>Zr</dt><dd>match</dd>
<dt>Nb</dt><dd>match</dd>
<dt>Mo</dt><dd>match</dd>
<dt>Tc</dt><dd>match</dd>
<dt>Ru</dt><dd>match</dd>
<dt>Rh</dt><dd>match</dd>
<dt>Pd</dt><dd>match</dd>
<dt>Ag</dt><dd>match</dd>
<dt>Cd</dt><dd>match</dd>
<dt>In</dt><dd>match</dd>
<dt>Sn</dt><dd>match</dd>
<dt>A</dt><dd>no match</dd>
<dt>At</dt><dd>no match</dd>
<dt>Ab</dt><dd>no match</dd>
<dt>Ad</dt><dd>no match</dd>
<dt>Ba</dt><dd>no match</dd>
<dt>Ce</dt><dd>no match</dd>
<dt>D</dt><dd>no match</dd>
<dt>E</dt><dd>no match</dd>
<dt>En</dt><dd>no match</dd>
<dt>Fa</dt><dd>no match</dd>
<dt>Fu</dt><dd>no match</dd>
<dt>Gu</dt><dd>no match</dd>
<dt>Ha</dt><dd>no match</dd>
<dt>Hu</dt><dd>no match</dd>
<dt>I</dt><dd>no match</dd>
<dt>Is</dt><dd>no match</dd>
<dt>J</dt><dd>no match</dd>
<dt>Ka</dt><dd>no match</dd>
<dt>Kb</dt><dd>no match</dd>
<dt>L</dt><dd>no match</dd>
<dt>La</dt><dd>no match</dd>
<dt>M</dt><dd>no match</dd>
<dt>Ma</dt><dd>no match</dd>
<dt>Ob</dt><dd>no match</dd>
<dt>Op</dt><dd>no match</dd>
<dt>Pa</dt><dd>no match</dd>
<dt>Pb</dt><dd>no match</dd>
<dt>Pe</dt><dd>no match</dd>
<dt>Pg</dt><dd>no match</dd>
<dt>Po</dt><dd>no match</dd>
<dt>Q</dt><dd>no match</dd>
<dt>Qs</dt><dd>no match</dd>
<dt>R</dt><dd>no match</dd>
<dt>Rs</dt><dd>no match</dd>
<dt>Sb</dt><dd>no match</dd>
<dt>St</dt><dd>no match</dd>
<dt>Ta</dt><dd>no match</dd>
<dt>Te</dt><dd>no match</dd>
<dt>U</dt><dd>no match</dd>
<dt>Ub</dt><dd>no match</dd>
<dt>Up</dt><dd>no match</dd>
<dt>Vw</dt><dd>no match</dd>
<dt>W</dt><dd>no match</dd>
<dt>Wv</dt><dd>no match</dd>
<dt>X</dt><dd>no match</dd>
<dt>Xe</dt><dd>no match</dd>
<dt>Xp</dt><dd>no match</dd>
<dt>Ya</dt><dd>no match</dd>
<dt>Yg</dt><dd>no match</dd>
<dt>Z</dt><dd>no match</dd>
<dt>Za</dt><dd>no match</dd>
</dl>
<div id="congratulations">Congratulations, your regex passes all the test cases! Remember to share this challenge.</div>
</section>
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Public domain. Site by <a href="http://macr.ae/">Callum Macrae</a>
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