Re: Re: splitting a string

Andrew Ballard wrote: > On Tue, Jan 5, 2010 at 10:20 AM, Ashley Sheridan > <ash@ashleysheridan.co.uk> wrote: >> On Tue, 2010-01-05 at 16:18 +0100, Daniel Egeberg wrote: >> >>> On Tue, Jan 5, 2010 at 16:09, Shawn McKenzie <nospam@mckenzies.net> wrote: >>>> Of course this doesn't work for something like >>>> 'My.Word.Document.docx' >>>> or 'archive_v2.0.1.tar.gz', but I don't know what will with >>>> extensions >>>> being variable length and possibly composed of multiple periods. >>> I suppose a solution to that could be having a list of known file >>> extensions and use that while falling back to one of the methods given >>> in this thread if there is no match in the list. Of course you would >>> then have to check .tar.gz before .gz if you're just iterating through >>> a list. You might also just choose the longest match (in terms of >>> number of periods). >>> >> >> That was my thought on how operating systems did it. If it maybe can't >> find a matching pattern, then it can fall back to matching anything >> after the last period. >> >> It always puzzles me, because some.archive.tar.gz is a valid file, but >> the extension is .tar.gz and the filename is some.archive. I guess it >> must compare the full filename to a list of knowns, and then try it's >> best after that. >> >> Thanks, >> Ash >> http://www.ashleysheridan.co.uk >> >> >> > > While relying on a file's extension to determine the type of its > contents is dangerous, isn't archive.tar.gz just a gzip'd file that > happens to contain a tarball named archive.tar? In that case, wouldn't > the correct extension just be .gz? > > Andrew Yes, or .tgz sometimes. -- Thanks! -Shawn http://www.spidean.com