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What Regex string are you using?

Not using any regex string, their is checkbox option to check it, can you let me know how can i add regex string.

https://www.regular-expressions.info/modifiers.html

Regex is a “language” for text matching. Checking the box does nothing (or ensures the failure) of the matching if you don’t actually provide the Regex.

You need to either put in the various case-sensitive options without selecting Regex, or look online to find out how to make your string case-insensitive by regex