Regular expression for not empty

Question

I need a Java regular expression, which checks that the given String is not Empty. However the expression should ingnore if the user has accidentally given whitespace in the

Answer 1

For testing on non-empty input I use:

private static final String REGEX_NON_EMPTY = ".*\\S.*"; 
// any number of whatever character followed by 1 or more non-whitespace chars, followed by any number of whatever character