Common Prefix, Prefix Pattern, and Wildcards

The Amazon S3 origin appends the common prefix to the prefix pattern to define the objects that the origin processes. You can specify an exact prefix pattern or you can use Ant-style path patterns to read multiple objects recursively.

Ant-style path patterns can include the following wildcards:

Question mark (?) to match a single character
Asterisk (*) to match zero or more characters
Double asterisks (**) to match zero or more directories

For example, to process all log files in US/East/MD/ and all nested prefixes, you can use the following common prefix and prefix pattern:

Common Prefix: US/East/MD/
Prefix Pattern: **/*.log

If the unnamed nested prefixes that you want to include appear earlier in the hierarchy, such as US/**/weblogs/, you can include the nested prefixes in the prefix pattern or define the entire hierarchy in the prefix pattern, as follows:

Common Prefix: US/
Prefix Pattern: **/weblogs/*.log

Common Prefix: 
Prefix Pattern: US/**/weblogs/*.log