Custom Rules allow you to validate your analytics and marketing tags against expected values.
You can set up rules to:
Test tags, variables, and values to confirm each matches a specific RegEx pattern (like a campaign code format)
Show failures in reports or alert you immediately
Fire based on URL, status code, or tag type by using filters
Set parameters, or conditions, to validate against the tags or pages that correspond to your filters
Combine filters and conditions to test your tags with a high level of detail
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