---
title: Using Regex In Scripts
slug: using-regex-in-scripts
createdAt: 2026-01-29T22:53:42.888Z
---

# Overview

After upgrading to Activate v8, developers may encounter a "forward to assembly" error when attempting to use regular expressions in scripts.

This occurs because the required .NET library is not automatically imported into the script context.

# Symptoms

You may see an error similar to:

- "Forwarded to assembly System.Text.RegularExpressions"

This error typically appears at compile time when a script references Regex or related classes.

# Cause

Activate v8 requires explicit imports for certain .NET libraries when used in scripts.

The **System.Text.RegularExpressions** namespace is not available unless it is explicitly imported.

# Resolution

To resolve the issue, add the required import and using statements to the script.

## Add the Import Directive

At the top of the script, add the following import directive:

:::BlockQuote
//@import System.Text.RegularExpressions;
:::

## Add the Using Statement

Add the corresponding using statement so the Regex classes can be referenced:

:::BlockQuote
using System.Text.RegularExpressions;
:::

Once both statements are present, the script will compile and Regex functionality can be used as expected.

# Notes and Considerations

- This behaviour is specific to Activate v8 and later
- Review existing scripts after upgrade for missing imports
- Similar errors may occur with other namespaces that are not implicitly available