Definitely helpful regular expressions

_\d{4}; [^@]: finds broken multi-citation keys Useful for ensuring that sentences begin in new line, thus keeping small changes easier distinguishable in git commit preview.
[^;] @\w*_.*_\d{4}\]: finds in-line citation keys that end with an unnecessary ].
\!\[(?!\*{2}): finds Markdown figures without bold 1st sentence; learned from http://stackoverflow.com/a/5900601/4341322
\ \[.{2,}]\ : finds in-line [@...] citations, but not tasks - [ ]
\w\ {2,}\w: finds duplicate whitespaces within text
\ {2,}\n: finds line-breaking double whitespaces on line end
\n.+\(.+\)\n- Your \w+ on Page \d+ \| .+ \| Added on \w+, \d+ \w+ \w+ \d+:\d+:\d+\n: finds meta-info in Kindle clippings
/(\b\S+\b)\s+\b\1\b/i: find duplicate, consecutive words; learned from http://stackoverflow.com/a/12309899/4341322
\.\w+\ : finds unformatted file extensions and numbers without non-breaking space before unit
find ways to add such searches to the makefile => "unit-test" like approach to eliminate repetition of errors

Possibly helpful regular expressions

rearrange converted .docx: [^ca|e\.g\sp|Ltd]\.\ => . \n & ``
\n[^#|\}|\\]\w[^\.|\>|\:\?]*\n[^MeOH|S32|LM|\*A|\(Fig][A-Z] finds open sentences
[a-z]{3,}[^s][^\W]s\ : finds 3rd-person singular, but also plural words
[^(\*A|Suppl|conc|approx|Prof|\d|esp|Ltd|z.B|Fig|e.g|www|\\\w*{)]\.[^\n|\r]: finds periods that aren't associated with abbreviations.