Creating Directories as needed

I need to create directories depending upon the matching of strings in 
subject.
for example
Subject: #string1#string2# rest of subject

I need to have the message filed to string1/string2/.

:0
* ^Subject:.##[a-zA-Z]*##[a-zA-Z]*##.*
string1/string2/.


If the directory exists, then go ahead and create a new numbered file.
If directory doesn't exist, create it and then create a new numbered 
file.
Any help on assigning the variables ($string1 $string2 and then doing a 
test will be appreciated.


bruce


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