isAllLetterUpperCase property
bool
get
isAllLetterUpperCase
Checks if the string contains only uppercase letters (A-Z).
This method uses a regular expression to determine if all characters in the string are uppercase letters. It does not consider numbers, symbols, or whitespace as uppercase letters.
Returns:
true
if the string consists entirely of uppercase letters, false
otherwise.
Returns false
for empty strings.
Example:
'UPPERCASE'.isAllLetterUpperCase; // Returns true
'MixedCase'.isAllLetterUpperCase; // Returns false
'123'.isAllLetterUpperCase; // Returns false
''.isAllLetterUpperCase; // Returns false
Implementation
bool get isAllLetterUpperCase => RegExp(r'^[A-Z]+$').hasMatch(this);