Supported RegEx Dialects

which dialect of regular expression is fully supported in graylog while writing extractors or performing searches? Should we always prefer the basic regular expression (BRE) or the extended RegEx (ERE) or some other like te EMACS, VIM, PCRE or the Perl6 or anyother?

Extractors (and the pipeline function regex()) support Java regular expressions:

The search is using the Lucene query language with a very restricted subset of regular expressions:

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