As adrianh has already noted, you can't say for sure if 'hello' is a quoted string or an unquoted one waiting for its quotes to be escaped.
A better regexp would be
print "quoted" if $string =~ /^["'].*\1$/;
But then again, it won't solve the problem of checking for escaped quotes within the string.
Take 'O'Reilly', for example. It will pass the quoted test, but it will have a unescaped quote inside.
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