VIM editor – delete lines longer than 50 charenters
You want to remove long lines, but not touch shorter lines.
Example: For each line longer than 50 chars,
:g/.\{50,\}/d
also
:g/^.\{,39\}$/d
and
:g/\(^.\{,39\}$\)\|\(^.\{61,\}$\)/d
should work.