---
title: internalError
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nsregularexpression/matchingflags/internalerror
---

# internalError

Set when matching failed due to an internal error.

## Declaration

```swift
static var internalError: NSRegularExpression.MatchingFlags { get }
```

## See Also

### Constants

- [progress](foundation/nsregularexpression/matchingflags/progress.md)
- [completed](foundation/nsregularexpression/matchingflags/completed.md)
- [hitEnd](foundation/nsregularexpression/matchingflags/hitend.md)
- [requiredEnd](foundation/nsregularexpression/matchingflags/requiredend.md)