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Laxman VattamLaxman Vattam 

recognising non utf-8 characters

I need to write a trigger to recognise non UTF-8 characters entered into name field of account and set some custom flag when user enters non UTF-8 characters. I started with below sample testing logic but it doesnt work. I always get the output as 'Non Match' in the below example. Please guide me on what is missing here. Open for alternate solutions as well.

Note: I just started with alphabets and numbers but need to change the logic to identify all UTF-8 characters 
String FirstName = 'Fred';
Pattern regexPattern = Pattern.compile('[a-zA-Z_0-9]');
Matcher regexMatcher = regexPattern.matcher(FirstName);

if (!regexMatcher.matches()) {
    System.debug(LoggingLevel.Debug, 'No Matches');
} else {
    System.debug(LoggingLevel.Debug, 'Matches');
}