TCharacter.IsLetter function

Member of TCharacterpublicIn unit Character

Check if a Unicode character is a letter.

Declaration

pascal

class function IsLetter(aChar: UCS4Char): Boolean; overload; static
class function IsLetter(AChar: UnicodeChar): Boolean; overload
 ; static
class function IsLetter(const AString: UnicodeString; AIndex: Integer)
: Boolean; overload; static

Arguments

`aChar`	UTF16 Character.
`AString`	String containing UTF-16 encoded characters.
`AIndex`	Index of UTF16 encoded character in `AString` to be checked.

Function result

True if the indicated characters is a letter.

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