List of regular expression patterns that define how to detect this custom PII type in content. Each pattern is a regular expression string that matches the specific format of the sensitive data. Multiple patterns can be provided to account for format variations, such as with or without delimiters, and different prefix conventions. Patterns evaluate using standard regular expression syntax and should be carefully tested to balance detection accuracy with false positive rates. When multiple patterns are provided, content matching any pattern is considered a match for this custom PII type.