(“regexps,” “regexp,” “regex”)
Type the following:
[M-x] query-replace-regexp [RET] \. \([A-Z]\) [RET] . \1 [RET]
In output file (“taldaemon_i_plus.td.txt” e.g.), AC used emacs regexp (regular expression) to reformat BA's, and just copied a rectangle to get region descriptions:
[M-x] replace-regexp [RET] ^.*Brodmann area.\([0-9]+\).* [RET] BA\1 [RET]
[Originally from Anthony's
science.txt file, entry dated 2015-09-03]
To remove all Windows newlines:
M-x replace-regexp C-q C-j RET RET
To add a newline before heading names, e.g. “I.” or “A.”
M-x replace-regexp .\. RET C-q C-j \& RET
[Put another way: insert spaces, insert empty line in between every line.]
M-x replace-regexp .$[RET] \&[C-q][C-j][RET]
“\&” is the emacs pattern that stands for “the entire matched pattern”
C-q indicates something like “insert the following input literally” (I remember it by thinking of this as “quoting” something).
C-j inserts a line break (a RETURN keypress, but this might not be the most precise description).