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);