When using the regular expression advanced search option, the results are not what is expected.
When searching for files using regular expressions, you must use a regular expression and not a glob pattern. Regular expressions are used to symbolically represent patterns that can occur in text. Like wildcards, certain characters have special meaning when specifying the text that can match the regular expression. The syntax of regular expressions is more complex and powerful than wildcards. This technique only needs to be used if wildcards are too limited to construct a sufficiently precise search pattern. Examples are below.