> 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，在匹配促销代码时非常有用。Regex 区分大小写，因此请务必将正则表达式设置为与促销代码大小写一致。

* Regex 和促销代码有两种主要的逻辑情况——`以……开头` 和 `以……结尾`.
* 在这个示例中，我们促销代码的基础是 `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代码， `SUMMER20OFF`, `SUMMER10`，以及 `SUMMER25`。我们希望将它们全部匹配以向我们的合作伙伴记账，该怎么做？我们会使用 `以……开头` 逻辑。只需在基础促销代码末尾添加一个句点和一个星号。

正则表达式应当恰好为 `^(SUMMER).*`

这将自动匹配任何以 `SUMMER` 开头并以其他任意字符结尾的促销代码。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代码， `20OFFSUMMER`, `10SUMMER`，以及 `25SUMMER` 其中促销代码总是以 `SUMMER`结尾。我们如何匹配它们？我们会使用 `以……结尾` 逻辑。只需在基础促销代码前面添加一个句点和一个星号，并添加一个 $ 来指定字符串的锚点。

正则表达式应当恰好为 `^.*(SUMMER)$`

这将自动匹配任何以其他字符开头并以 `SUMMER`结尾的促销代码。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 [联系支持团队](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)` 在 `^` 之后来移除正则表达式的大小写敏感性。
{% endhint %}

#### 示例

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


---

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