Function IsAlpha() Foundation
Tests whether a character string begins with a letter.
IsAlpha( <cString> ) --> lBoolean
When the first character in <cString> is a letter, IsAlpha() returns .T. (true), otherwise it returns .F. (false).
The character function IsAlpha() tests whether the first character in a character string is a letter (an alphabetical character). Lower and upper case letters from A to Z are recognized as letters. In addition language dependent special characters like umlauts or , and are identified as alphabetical characters if the appropriate collation table is selected. If the first character is a digit, blank space, punctuation mark and other graphic character, IsAlpha() returns .F. (false).
The result depends on SET COLLATION and can be manipulated by LocaleConfigure() .
// The example shows various results for the function IsAlpha()
PROCEDURE Main
? IsAlpha("Xbase++") // result: .T.
? IsAlpha("Xbase++") // result: .T.
? IsAlpha("eastern") // result: .T.
? IsAlpha("1,0") // result: .F.
? IsAlpha(",null") // result: .F.
? IsAlpha(" null") // result: .F.
RETURN
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