- 小写字母 xiǎoxiězìmǔ lowercaselowercase letters
- 大小写 dàxiǎoxiě letter casecapitals and lowercase letters
- 不区分大小写 bùqūfēndàxiǎoxiě case-insensitivenot distinguishing between uppercase and lowercase letters
- 区分大小写 qūfēndàxiǎoxiě case-sensitivedistinguishing between uppercase and lowercase letters