GA4 API中DOES_NOT_MATCH_REGEX过滤匹配类型无法正常使用

问题根源在于GA4 API的Python客户端库枚举定义：Filter.StringFilter.MatchType中并没有DOES_NOT_MATCH_REGEX这个枚举值，网页端的同名选项和API的枚举逻辑不直接对应。要实现“排除匹配正则的sessionSourceMedium”，需要通过否定表达式包裹FULL_REGEXP过滤器来实现。

修改后的代码如下：

def run_ga4_report(property_id, property_name):
    # 构建匹配正则的过滤器，再用NOT表达式实现排除逻辑
    filter_expression = FilterExpression(
        not_expression=FilterExpression(
            filter=Filter(
                field_name="sessionSourceMedium",
                string_filter=Filter.StringFilter(
                    match_type=Filter.StringFilter.MatchType.FULL_REGEXP,
                    value=filter_pattern
                )
            )
        )
    )

    # Build the request
    request = RunReportRequest(
        property=f"properties/{property_id}",
        date_ranges=[
            {"start_date": DATE_RANGE_START, "end_date": DATE_RANGE_END}
        ],
        dimensions=[{"name": dim} for dim in dimensions_input],
        metrics=[{"name": metric} for metric in metrics_input],
        dimension_filter=filter_expression  # Apply filter on sessionSourceMedium
    )
    
    # Execute the GA4 API request
    try:
        response = client.run_report(request)
    except Exception as e:
        print(f"Error fetching data from GA4 API for property {property_name} (ID: {property_id}): {e}")
        return None

核心逻辑：先用FULL_REGEXP匹配你要排除的模式，再通过FilterExpression.not_expression将这个匹配逻辑取反，最终实现网页端“DOES_NOT_MATCH_REGEX”的效果。

内容的提问来源于stack exchange，提问作者Yogita Patel