edit ValidateChars property
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Applies to
acEdit component.  

property ValidateChars: Boolean;  

The VaildateChars property controls whether you would like to validate the typed characters. If you would like to validate them — set the ValidateChars to True and specify characters allowed for input in the ValidChars property.  
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.  

See also
ValidChars property.