Wildcard and Regular Expressions
  

Wildcard:
There are two kind of wildcards, one is (*), the other is (?). (*) stands for any number of characters (?)stands for one character. and they are case-insensitive.

Example:
*.txt matchs aaa.txt and bbb.txt
a?.txt matchs aa.txt and ab.txt

Regular Expressions:
Regular Expressions allow to search complex patterns of words. it looks a bit hard for novices, but it's really simple and powerful.

FTPRush use TRegExp Studio as Regular Expressions Parser, it may be different as PERL Regular Expressions. to learn how it works, please visit http://regexpstudio.com/TRegExpr/Help/RegExp_Syntax.html