TCharacter.IsLetter¶

Check if a Unicode character is a letter.

Declaration¶

Source position: character.pas line 138

public 
class function IsLetter(aChar: UCS4Char) : Boolean;  overload;  static; overload;

class function IsLetter(AChar: UnicodeChar) : Boolean;  overload
                       ;  static; overload;

class function IsLetter(const AString: UnicodeString; AIndex: Integer)
                        : Boolean;  overload;  static; overload;

Description¶

IsLetter returns True if a Unicode character has category that is one of the letter categories (ucUppercaseLetter, ucLowercaseLetter, ucTitlecaseLetter, ucModifierLetter, ucOtherLetter). The character can be specified as a UTF16 character AChar or a UTF16 encoded character starting at position AIndex in string AString.

Errors¶

If AIndex is not a valid character index in the string AString, an EArgumentOutOfRangeException exception is raised. If the character at that position is not complete, an

See also¶

Name	Description
EArgumentException	Invalid argument passed to a function.
IsControl	Check whether a Unicode character is a Unicode control character.
IsDigit	Check whether a Unicode character is a digit.
IsSurrogate	Check whether a Unicode character is a surrogate.
IsHighSurrogate	Check whether a Unicode character is a surrogate in the high range.
IsLowSurrogate	Check whether a Unicode character is a surrogate in the low range.
IsSurrogatePair	Check if a pair of characters is a set of high/low surrogate characters.
IsLetter	Check if a Unicode character is a letter.
IsLetterOrDigit	Check if a Unicode character is a letter or digit.
IsLower	Check if a Unicode character is a lowercase letter.
IsNumber	Check if a Unicode character is a number.
IsPunctuation	Check if a Unicode character is a punctuation character.
IsSymbol	Check if a Unicode character is a symbol character.
IsUpper	Check whether a Unicode character is an uppercase letter.
IsWhiteSpace	Check whether a Unicode character is a whitespace character.