---
title: kUnicodeMatchUnicodeBaseBit
framework: Core Services
role: symbol
role_heading: Enumeration Case
platforms: [Mac Catalyst 17.0+, macOS 10.0+]
path: coreservices/1433572-unicode_matching_flags/kunicodematchunicodebasebit
---

# kUnicodeMatchUnicodeBaseBit

Excludes mappings that do not match the text encoding base of the unicodeEncoding field of the structure UnicodeMapping.

## Declaration

```occ
kUnicodeMatchUnicodeBaseBit = 0
```