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Aakash Panchal 2020-03-08 14:13:10 +05:30 committed by GitHub
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Akash Articles/RegEx/named_groups.html
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<html>
<head>
<style type="text/css">
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<p>Below is a code, we have already looked in <strong>capturing groups</strong> part. You can see, the code is more readable now.</p>
<pre><code class="js language-js"> var str = "2020-01-20";
<pre><code class="js language-js">var str = "2020-01-20";
// Pattern string
var pattern = /(?&lt;year&gt;\d{4})-(?&lt;month&gt;\d{2})-(?&lt;day&gt;\d{2})/g;
// Pattern string
var pattern = /(?&lt;year&gt;\d{4})-(?&lt;month&gt;\d{2})-(?&lt;day&gt;\d{2})/g;
// ^ ^ ^
//group-no: 1 2 3
// ^ ^ ^
//group-no: 1 2 3
// Data replacement using $&lt;group_name&gt;
var ans=str.replace(pattern, '$&lt;day&gt;-$&lt;month&gt;-$&lt;year&gt;');
// Data replacement using $&lt;group_name&gt;
var ans=str.replace(pattern, '$&lt;day&gt;-$&lt;month&gt;-$&lt;year&gt;');
console.log(ans);
// Output will be: 20-01-2020
console.log(ans);
// Output will be: 20-01-2020
</code></pre>
<p>Backreference syntax for numbered groups works for named capture groups as well. <code>\k&lt;name&gt;</code> matches the string that was previously matched by the named capture group <code>name</code>, which is a standard way to backreference named group.</p>