---
title: illegalCharacters
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nscharacterset/illegalcharacters
---

# illegalCharacters

A character set containing values in the category of Non-Characters or that have not yet been defined in version 3.2 of the Unicode standard.

## Declaration

```swift
class var illegalCharacters: CharacterSet { get }
```

## Return Value

Return Value A character set containing all the illegal characters.

## See Also

### Getting Standard Character Sets

- [alphanumerics](foundation/nscharacterset/alphanumerics.md)
- [capitalizedLetters](foundation/nscharacterset/capitalizedletters.md)
- [controlCharacters](foundation/nscharacterset/controlcharacters.md)
- [decimalDigits](foundation/nscharacterset/decimaldigits.md)
- [decomposables](foundation/nscharacterset/decomposables.md)
- [letters](foundation/nscharacterset/letters.md)
- [lowercaseLetters](foundation/nscharacterset/lowercaseletters.md)
- [newlines](foundation/nscharacterset/newlines.md)
- [nonBaseCharacters](foundation/nscharacterset/nonbasecharacters.md)
- [punctuationCharacters](foundation/nscharacterset/punctuationcharacters.md)
- [symbols](foundation/nscharacterset/symbols.md)
- [uppercaseLetters](foundation/nscharacterset/uppercaseletters.md)
- [whitespacesAndNewlines](foundation/nscharacterset/whitespacesandnewlines.md)
- [whitespaces](foundation/nscharacterset/whitespaces.md)