[File] [PATCH] Tighten dataone format matching

Dirk Müller dirk at dmllr.de
Wed Apr 13 20:35:41 UTC 2022

* regex rules need literal dots escaped, otherwise they are considered
any character
* literal search strings can be searched using search rather than the
 much more expensive regex
* use standard xml declaration search as used in other format matchers
* only match the first 1024 bytes, the information we look for should
 be in the very first tag.
* remove unnecessary parentheses
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