edit ValidChars property
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Applies to
acEdit component.  

property ValidChars: String;  

The ValidChars property specifies the set of characters, allowed for input into the acEdit control when the ValidateChars is True.  
When the ValidateChars is True, the acEdit control will allow to input only characters specified in ValidChars property. All others, not specified symbols will be forbidden.  
tip For example, you would like to allow only lower-case latin characters without numbers. Set ValidChars to 'abcdefghijklmnopqrstuvwxyz' and ValidateChars to True.  

See also
ValidateChars property.