> For the complete documentation index, see [llms.txt](https://docs.yarnspinner.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yarnspinner.dev/2.4/api/csharp/yarn.compiler.upgrader/yarn.compiler.upgrader.textreplacement/yarn.compiler.upgrader.textreplacement.start.md).

# Start

Field in [TextReplacement](/2.4/api/csharp/yarn.compiler.upgrader/yarn.compiler.upgrader.textreplacement.md)

## Summary

The position in the original string where the substitution should be made.

```csharp
public int Start;
```