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Akash Articles/RegEx/character_classes.html
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<html>
<head>
<style type="text/css">
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<body>
<h2 id="characterclasses">Character classes:</h2>
<h2 id="characterclasses">Character classes</h2>
<div class="container">
<iframe scrolling="no" style="position: absolute; top: -9999em; visibility: hidden;" onload="this.style.position='static'; this.style.visibility='visible';" src="https://regexr.com/4vtj8" class="embed"></iframe>
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<iframe scrolling="no" style="position: absolute; top: -9999em; visibility: hidden;" onload="this.style.position='static'; this.style.visibility='visible';" src="https://regexr.com/4vtjb" class="embed"></iframe>
</div>
<p>What did you observe? You can see that, adding <code>[sm]</code> matches both $soon$ and $moon$. Here <code>[sm]</code> is called character class, which is basically a list of characters we want to match.</p>
<p>What did you observe? You can see that, adding <code>[sm]</code> matches both "soon" and "moon". Here <code>[sm]</code> is called character class, which is basically a list of characters we want to match.</p>
<p>More formally, <code>[abc]</code> is basically 'either a or b or c'.</p>
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<li><p><strong>RegEx:</strong> <code>[a-d][^l-o][12][^5-7][l-p]</code>
<br> <strong>Text</strong>: co13i, ae14p, eo30p, ce33l, dd14l.</p>
<p>Answer:
<div class="container"></p>
<p>Answer:</p>
<div class="container">
<iframe scrolling="no" style="position: absolute; top: -9999em; visibility: hidden;" onload="this.style.position='static'; this.style.visibility='visible';" src="https://regexr.com/4vtlj" class="embed"></iframe>
<p></div></p></li>
</ol>
<p><strong>Note:</strong> If you write the range in reverse order (ex. 9-0), then it is an error.</p>
<ol>
</div>
<p><strong>Note:</strong> If you write the range in reverse order (ex. 9-0), then it is an error.</p></li>
<li><strong>RegEx:</strong> <code>[a-zB-D934][A-Zab0-9]</code><br>
<strong>Text:</strong> t9, da, A9, zZ, 99, 3D, aCvcC9.
Answer:
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<h2 id="predefinedcharacterclasses">Predefined Character Classes</h2>
<p>Some character classes are used so frequently that there are shorthand notations defined for them. Let's see one by one.</p>
<ol>
<li><p><strong><code>\w</code> &amp; <code>\W</code></strong>: <code>\w</code> is just a short form of a character class <code>[A-Za-Z0-9_]</code>. <code>\w</code> is called word character class.</p>
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<iframe scrolling="no" style="position: absolute; top: -9999em; visibility: hidden;" onload="this.style.position='static'; this.style.visibility='visible';" src="https://regexr.com/4vtmk" class="embed"></iframe>
</div>
<ol>
<li><strong><code>\s</code> &amp; <code>\S</code></strong>: <code>\s</code> matches whitespace characters. Tab(<code>\t</code>), newline(<code>\n</code>) &amp; space(<code></code>) are whitespace characters. These characters are called non-printable characters.</li></ol>
<li><strong><code>\s</code> &amp; <code>\S</code></strong>: <code>\s</code> matches whitespace characters. Tab(<code>\t</code>), newline(<code>\n</code>) &amp; space(<code></code>) are whitespace characters. These characters are called non-printable characters.</li>
<div class="container">
<iframe scrolling="no" style="position: absolute; top: -9999em; visibility: hidden;" onload="this.style.position='static'; this.style.visibility='visible';" src="https://regexr.com/4vtmn" class="embed"></iframe>