> For the complete documentation index, see [llms.txt](https://help.impact.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.impact.com/brand/zh/what-would-you-like-to-learn-about/platform-features/promo-codes/regular-expression/regex-explained.md).

# 正则表达式说明

Regex（或正则表达式）是一种可用于匹配通用文本的代码，在匹配促销码时非常有用。Regex 区分大小写，因此请务必根据你的促销码的大小写设置你的正则表达式。

* Regex 和促销码主要有两种逻辑情况——`以……开头` 和 `以……结尾`.
* 在这个例子中，我们的促销码基础是 `SUMMER`.

{% tabs %}
{% tab title="以……开头" %}
你已经向合作伙伴发放了一系列夏季促销码， `SUMMER20OFF`, `SUMMER10`，以及 `SUMMER25`。我们想把它们全部匹配出来，以便为我们的合作伙伴记入信用，该怎么做呢？我们会使用 `以……开头` 逻辑。只需在你的基础促销码末尾添加一个句点和一个星号。

正则表达式应当正好是 `^(SUMMER).*`

这将自动匹配任何以 `SUMMER` 开头并以任意其他字符结尾的促销码。任何不以 `SUMMER` 开头的代码都不会被匹配。
{% endtab %}

{% tab title="以……结尾" %}
你已经向合作伙伴发放了一系列夏季促销码， `20OFFSUMMER`, `10SUMMER`，以及 `25SUMMER` 其中促销码总是以 `SUMMER`结尾。我们如何匹配它们？我们会使用 `以……结尾` 逻辑。只需在你的基础促销码开头添加一个句点和一个星号，并添加一个 $ 来指定字符串锚点。

正则表达式应当正好是 `^.*(SUMMER)$`

这将自动匹配任何以其他字符开头并以 `SUMMER`结尾的促销码。任何不以 `SUMMER` 开头的代码都不会被匹配。
{% endtab %}
{% endtabs %}

对于更复杂的表达式，请联系你的 CSM 或 [联系支持](https://app.impact.com/support/portal.ihtml?createTicket=true\&accountType=ADVERTISER) 寻求帮助。

{% hint style="info" %}
**注意：** 你可以通过添加 `(?i)` 来移除正则表达式的大小写敏感性， `^` 在你的正则表达式中。
{% endhint %}

#### 示例

```programlisting
^(?i)(SUMMER).*
```


---

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