[xsl] string manipulation - retreiving a directory name from a path

[tom tom <tomxsllist@xxxxxxxxxxx>]

I need to extract the string that appears between the first '/' and the second
'/' from
a string that takes the form of:  '/home/dir1/dir2/file.html'.

Can anyone suggest a way to do this, maybe utilising a regular expression,
other than substring-before(substring-after($string, '/') '/')

Thanks
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