如何匹配not null + not empty？

^(?!\s*$).+

def is_not_null_or_empty(string):
    return string is not None and string.strip() != ""

# 示例用法
string = "example"
if is_not_null_or_empty(string):
    print("String is not null or empty")
else:
    print("String is null or empty")

public boolean isNotNullOrEmpty(String string) {
    return string != null && !string.trim().isEmpty();
}

// 示例用法
String string = "example";
if (isNotNullOrEmpty(string)) {
    System.out.println("String is not null or empty");
} else {
    System.out.println("String is null or empty");
}