Sorting arrays with strings

FROM : Mr. Gecko
DATE : Sat Mar 15 14:25:37 2008

Hello I have a NSArray with all of the files names in a directory that 
my user specifies with an Open panel and I am needing to sort it in 
numeric order like -0 to -9 and 0 to 9 each file does have other 
things in the name for an example the name of the files are like 
text-1254.txt, text6578.txt is there a way to make an array with 
objects such as text-12. txt, text-3.txt, text6.txt, text654.txt be 
sorted like text-3.txt, text-12.txt, text6.txt, text654.txt
If you understand what I mean.

Thanks for any help,
Mr. Gecko