Functions and Directives Functions and Directives

Function IsAlpha() Foundation

Tests whether a character string begins with a letter.

Syntax
IsAlpha( <cString> ) --> lBoolean
Parameters
<cString>
<cString> is a character string expression.
Return

When the first character in <cString> is a letter, IsAlpha() returns .T. (true), otherwise it returns .F. (false).

Description

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() .

Examples
IsAlpha() 
// 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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