> 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/es/what-would-you-like-to-learn-about/platform-features/promo-codes/regular-expression/match-expression-tool-regex.md).
# Regex de la herramienta Match Expression
La herramienta de expresión de coincidencia se usa cuando conoces una parte de las combinaciones de caracteres en los SKU, categorías o códigos promocionales de tu producto y te gustaría hacer coincidir estas combinaciones de caracteres con los SKU, categorías o códigos promocionales enviados con tus conversiones. Solo necesitarías usar esta herramienta cuando no tengas la lista completa de elementos en un [lista de excepciones](/brand/es/what-would-you-like-to-learn-about/account-administration/program-settings/exception-lists/create-category-and-sku-exception-lists.md).
1. En la barra de navegación superior, selecciona  **\[Perfil de usuario] → Configuración**.
2. En la columna de la derecha, debajo de *Listas de excepciones*, seleccione *Listas de excepciones* sección, seleccione **SKU**.
3. Seleccione **Agregar nueva lista de SKU**.
4. Seleccione **Mostrar configuración avanzada** .
5. En el campo Expresiones de coincidencia, estos son 2 componentes importantes de la herramienta de expresiones de coincidencia:
| Componente | Descripción |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------ |
| [Regex dentro de los paréntesis](/brand/es/what-would-you-like-to-learn-about/platform-features/promo-codes/regular-expression/regex-inside-the-parentheses.md) | Coincide exactamente con los elementos de la lista de excepciones adjunta. |
| [Regex fuera de los paréntesis](/brand/es/what-would-you-like-to-learn-about/platform-features/promo-codes/regular-expression/regex-outside-the-parentheses.md) | Establece las condiciones para que los elementos de la lista de excepciones se comparen con los datos de conversión entrantes. |
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