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You can try<br />

<pre><code class="code-1 nolinks" id="code-20-41784959-1"><span>var r = str.replace(/(\[\d+\]\[\d+\])(\[\d+\])/, '$1[X]') ;</span>
</code></pre>
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Is there a way to accommodate the possibility of text between brackets in the strong?<br />
<br />
In the example below, [33] should be replaced with [X] in both scenarios. <br />

<pre><code class="code-1 nolinks" id="code-20-41784980-1"><span>var str = 'hello[11][22][33][44][55]';</span>
<span>var str = 'hello[11][world][22][example7][33][value][44][test][55]';</span>
</code></pre>
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<div>
Now [33] is not the third bracketed set of characters. It is the fifth. How do you know to replace the fifth one in this case? Or are you always replacing <i>[33]</i> precisely?
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<div>
I want to replace the third group of bracketed numbers. &nbsp;So [123] should count but [xyz] should not. &nbsp;I only want the third group of bracketed numbers. &nbsp;Thanks!
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<div class="content wysiwyg-content">
Using JavaScript and Regular Expressions, how can I replace the third match?<br />
<br />
For example, I want JavaScript to return this:<br />
<b>hello[11][22][X][44][55]'</b><br />

<pre><code class="code-1 nolinks" id="code-10-28967782-1"><span>var str = 'hello[11][22][33][44][55]';</span>
<span>alert( str.replace(/(\[[0-9]+\]){3}/, '[X]')  );</span>
</code></pre>
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Using JavaScript and Regular Expressions, how can I replace the third match?

For example, I want JavaScript to return this:
hello[11][22][X][44][55]'
(CODE)

JavaScript/REGEX: Replace the 3rd match

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

A regular expression ("regex") is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK. Many programming languages provide regular expression capabilities, some built-in, for example Perl, JavaScript, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11). Most other languages offer regular expressions via a library.