TCharacter.IsLetter

Check if a Unicode character is a letter.

Declaration

Source position: character.pas line 111

public 
  class function IsLetter(AChar: UnicodeChar) : Boolean;  Overload
                         ;  Static;
  class function IsLetter(const AString: UnicodeString; AIndex: Integer)
                          : Boolean;  Overload;  Static;

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
IsHighSurrogate	Check whether a Unicode character is a surrogate in the high range
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
IsLowSurrogate	Check whether a Unicode character is a surrogate in the low range
IsNumber	Check if a Unicode character is a number
IsPunctuation	Check if a Unicode character is a punctuation character
IsSurrogate	Check whether a Unicode character is a surrogate
IsSurrogatePair	Check if a pair of characters is a set of high/low surrogate characters
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