How do I use Nant/Ant naming patterns?

I have to admit that I always forgot the syntactical intracacies of the naming patterns for Nant (eg. those used in filesets). The double asterisk/single asterisk stuff seems to be very forgettable in my mind.

Can someone provide a definitive guide to the naming patterns?

The rules are:

• a single star (*) matches zero or more characters within a path name
• a double star (**) matches zero or more characters across directory levels
• a question mark (?) matches exactly one character within a path name

Another way to think about it is double star (**) matches slash (/) but single star (*) does not.

Let's say you have the files:

1. bar.txt
2. src/bar.c
3. src/baz.c
4. src/test/bartest.c

Then the patterns:

• *.c             matches nothing (there are no .c files in the current directory)
• src/*.c     matches 2 and 3
• */*.c         matches 2 and 3 (because * only matches one level)
• **/*.c       matches 2, 3, and 4 (because ** matches any number of levels)
• bar.*         matches 1
• **/bar.*   matches 1 and 2
• **/bar*.* matches 1, 2, and 4
• src/ba?.c matches 2 and 3    

Here's a few extra pattern matches which are not so obvious from the documentation. Tested using NAnt for the example files in benzado's answer:

1. bar.txt
2. src/bar.c
3. src/baz.c
4. src/test/bartest.c

• src**                      matches 2, 3 and 4
• **.c                        matches 2, 3, and 4
• **ar.*                    matches 1 and 2
• **/bartest.c/**  matches 4
• src/ba?.c/**        matches 2 and 3

Check out the Nant reference. The fileset patterns are:

'*' matches zero or more characters, e.g. *.cs
'?' matches one character, e.g. ?.cs

And '**' matches a directory tree e.g. src/**/*.cs will find all cs files in any sub-directory of src.