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Update Backreferencing.html

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Aakash Panchal
2020-03-08 15:19:55 +05:30
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Akash Articles/RegEx/Backreferencing.html
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<html>
<head>
<style type="text/css">
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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/4vu7p" class="embed"></iframe>
</div>
<h3 id="backreferencingandquantifiers">Backreferencing and quantifiers</h3>
<h3 id="backreferencingandquantifiers">Backreferencing and Quantifiers</h3>
<p>When we are using a backreference for an expression with quantifiers, then we have to be careful. Let's observe it:</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/4vu85" class="embed"></iframe>
<iframe scrolling="no" style="position: absolute; top: -9999em; visibility: hidden;" onload="this.style.position='static'; this.style.visibility='visible';" src="https://regexr.com/4vuet" class="embed"></iframe>
</div>
<p>Note that <code>(\d)+</code> and <code>(\d+)</code> both are different. So, what will happen for <code>(\d)+ -- \1</code> expression and same text above?</p>