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private function input_text():void{
var content:String = input.text;
labe.text = StringReplaceAll(content,"abc","<bold>abc</bold>");
}
private function StringReplaceAll(source:String, find:String, replacement:String ):String{
return source.split( find ).join( replacement );
}
<mx:TextInput id="input" change="input_text()" />
<mx:Label text="" id="labe" />