TCharacter.IsNumber¶

Check if a Unicode character is a number.

Declaration¶

Source position: character.pas line 151

public 
class function IsNumber(AChar: UnicodeChar) : Boolean;  overload
                       ;  static; overload;

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

class function IsNumber(aChar: UCS4Char) : Boolean;  overload;  static; overload;

Description¶

IsNumber returns True if a Unicode character has category that is one of the number categories (ucDecimalNumber, ucLetterNumber, ucOtherNumber). 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 EArgumentException exception is raised.

See also¶

Name	Description
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.