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Check if a Unicode character is a letter.
Source position: character.pas line 111
public class function TCharacter.IsLetter( |
AChar: UnicodeChar |
):Boolean; overload; |
const AString: UnicodeString; |
AIndex: Integer |
):Boolean; overload; |
AChar |
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UTF16 Character |
True if the indicated characters is a letter.
AString |
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String containing UTF-16 encoded characters |
AIndex |
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Index of UTF16 encoded character in AString to be checked. |
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.
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
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Invalid argument passed to a function |
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Check whether a Unicode character is a Unicode control character |
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Check whether a Unicode character is a digit |
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Check whether a Unicode character is a surrogate |
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Check whether a Unicode character is a surrogate in the high range |
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Check whether a Unicode character is a surrogate in the low range |
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Check if a pair of characters is a set of high/low surrogate characters |
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Check if a Unicode character is a letter. |
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Check if a Unicode character is a letter or digit |
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Check if a Unicode character is a lowercase letter |
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Check if a Unicode character is a number |
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Check if a Unicode character is a punctuation character |
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Check if a Unicode character is a symbol character |
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Check whether a Unicode character is an uppercase letter |
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Check whether a Unicode character is a whitespace character |