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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('[\?&]' + name + '=([^&#]*)').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('[\?&]' + name + '=([^&#]*)', '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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