How do I replace or find non-printable characters in vim regex?

Removing control symbols only:

:%s/[[:cntrl:]]//g

Removing non-printable characters (note that in versions prior to ~8.1.1 this removes non-ASCII characters also):

:%s/[^[:print:]]//g

The difference between them could be seen if you have some non-printable-non-control characters, e.g. zero-width space:

Say you want to replace ^C with C:

:%s/CtrlVC/C/g

Where CtrlVC means type V then C while holding Ctrl pressed.

CtrlV lets you enter control characters.

Try this after saving your file in vim (assuming you are in Linux environment)

:%!tr -cd '[:print:]\n'

None of the answers here using Vim's control characters worked for me. I had to enter a unicode range.

:%s/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F]//g

That unicode range was found on this other post: https://stackoverflow.com/a/8171868/231914

You can use:

:%s/^C//g

To get the ^C hold the control key, press V then C (Both while holding the control key) and the ^C will appear. This will find all occurrences and replace them with nothing.

To remove both ^C and ^B you can do:

:%s/^C\|^B//g