What do you mean by 'fixed length' ? Can you give an example?
Also there's a guide to writing grammars here:
Sorry, I mean fixed field length. So for example a configuration file which is not delimited, but say field 1 goes from character position 1 to 10, field 2 from 11 to 45 and so on.
By the way, the link doesn't appear to work, it keeps requesting a login.
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It should be possible, but I don't think we have any examples. That grammar guide may help you to write one.