How to Perform Case-Insensitive Regex Searches in JavaScript?

Case-Insensitive Regex Searches in JavaScript

When extracting query strings from URLs in JavaScript, performing case-insensitive comparisons for query string names is often necessary. However, the standard regular expression defined as follows performs case-sensitive searches:

<code class="js">var results = new RegExp('[\?&amp;]' + name + '=([^&amp;#]*)').exec(window.location.href);</code>

To achieve case-insensitive searches, the 'i' modifier, which stands for "ignore case," must be appended to the regular expression:

<code class="js">var results = new RegExp('[\?&amp;]' + name + '=([^&amp;#]*)', 'i').exec(window.location.href);</code>

By incorporating the 'i' modifier, the regular expression becomes case-insensitive and can effectively match query string names regardless of their letter casing, improving the robustness of your JavaScript code when handling URLs with varying query string capitalization.

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