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LowerCaseQ[string]

yields True if all the characters in the string are lowercase letters, and yields False otherwise.

Details
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Examples  
Basic Examples  
Scope  
Properties & Relations  
Possible Issues  
Neat Examples  
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LowerCaseQ

LowerCaseQ[string]

yields True if all the characters in the string are lowercase letters, and yields False otherwise.

Details

  • LowerCaseQ treats both ordinary and special characters.

Examples

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Basic Examples  (1)

Test whether a character is a lowercase letter:

Wolfram Language code: LowerCaseQ["a"]
Wolfram Language code: LowerCaseQ["Z"]

Scope  (4)

Test whether all characters in a string are lowercase letters:

Wolfram Language code: LowerCaseQ["abcdABCD"]

Accented letters are still treated as letters:

Wolfram Language code: LowerCaseQ["äé"]

Gothic letters are treated as letters:

Wolfram Language code: LowerCaseQ["𝔞𝔟𝔠𝔡𝔢"]

Greek letters are treated as letters:

Wolfram Language code: LowerCaseQ["αβγδϵζηθ"]

Properties & Relations  (2)

All characters treated as lowercase letters:

Wolfram Language code: Style[StringJoin[Select[Characters[FromCharacterCode[Range[2 ^ 16 - 1]]], LowerCaseQ]], 14]

No letters are both uppercase and lowercase:

Wolfram Language code: Select[Characters[FromCharacterCode[Range[2 ^ 16 - 1]]], UpperCaseQ[#] && LowerCaseQ[#]&]

Possible Issues  (1)

Some letters are neither uppercase nor lowercase:

Wolfram Language code: "ℵ"
Wolfram Language code: {LetterQ[%], UpperCaseQ[%], LowerCaseQ[%]}

Neat Examples  (1)

Find all letters that are neither uppercase nor lowercase:

Wolfram Language code: Select[Characters[FromCharacterCode[Range[2 ^ 16 - 1]]], LetterQ[#] && !UpperCaseQ[#] && !LowerCaseQ[#]&]
Wolfram Research (1991), LowerCaseQ, Wolfram Language function, https://reference.wolfram.com/language/ref/LowerCaseQ.html (updated 1996).

Text

Wolfram Research (1991), LowerCaseQ, Wolfram Language function, https://reference.wolfram.com/language/ref/LowerCaseQ.html (updated 1996).

CMS

Wolfram Language. 1991. "LowerCaseQ." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 1996. https://reference.wolfram.com/language/ref/LowerCaseQ.html.

APA

Wolfram Language. (1991). LowerCaseQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/LowerCaseQ.html

BibTeX

@misc{reference.wolfram_2026_lowercaseq, author="Wolfram Research", title="{LowerCaseQ}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/LowerCaseQ.html}", note=[Accessed: 12-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_lowercaseq, organization={Wolfram Research}, title={LowerCaseQ}, year={1996}, url={https://reference.wolfram.com/language/ref/LowerCaseQ.html}, note=[Accessed: 12-June-2026]}