Identify special characters that are not supported by an embeded font

Hi!
I'm useing embeded fonts as CFF in my flex 4.5.1 application and I have problems with the special charcters  like Ă, Â, Î, Ș, Ț or arabic text, that are not included in my embeded font. This are displayed in my RichEditableTect component useing the default font (Arial).
Is there any way to block the user when he tries to add such characters? 
Or can  I identify them before saveing , in order to format the text like <Text Font="ExoticFont"...>Hello<Text font-family="Arial">ë</Text></Text> ?

I think you want to use Font.hasGlyphs.  If you are using the @font-face directive it is hard to get to the Font class so you may wish to switch to using the directive.

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