Negative Regex Filter in Control Field

[victortorneiros]

Hello,

I'm trying to apply a negative filter using a regex expression in a control field within Looker Studio. Specifically, I want to exclude rows that contain the word "Invierno" anywhere in the string.

I've tried using the following expression in the control field's regex option:

^((?!Invierno).)*$

However, this does not seem to work as expected, and it still returns rows that contain "Invierno". I understand this is a negative lookahead expression that should exclude any string containing the word, but I can't get it to function properly in Looker Studio.

Could you please advise if there's an alternative method or if Looker Studio has limitations with such expressions? Any help or suggestions would be greatly appreciated.

Thank you!