Question

105

javascript regex for extracting filename from Content-Disposition header

rated 0 times [ 107] [ 2] / answers: 1 / hits: 25508 / 10 Years ago, mon, april 14, 2014, 12:00:00

Content-disposition header contains filename which can be easily extracted, but sometimes it contains double quotes, sometimes no quotes and there are probably some other variants too. Can someone write a regex which works in all the cases.

Content-Disposition: attachment; filename=content.txt

Here are some of the possible target strings:

attachment; filename=content.txt

attachment; filename*=UTF-8''filename.txt

attachment; filename=EURO rates; filename*=utf-8''%e2%82%ac%20rates

attachment; filename=omáèka.jpg

and some other combinations might also be there

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lidialyrick

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answered 10 Years ago dayana · Accepted Answer

You could try something in this spirit:

filename[^;=n]*=(([']).*?2|[^;n]*)



filename      # match filename, followed by

[^;=n]*      # anything but a ;, a = or a newline

=

(             # first capturing group

    (['])    # either single or double quote, put it in capturing group 2

    .*?       # anything up until the first...

    2        # matching quote (single if we found single, double if we find double)

|             # OR

    [^;n]*   # anything but a ; or a newline

)

Your filename is in the first capturing group: http://regex101.com/r/hJ7tS6