Vim regex to substitute/escape pipe characters

Question

Let\'s suppose I have a line:

a|b|c

I\'d like to run a regex to convert it to:

a\\|b\\|c

In most regex engine

Answer 1

If you use very-magic (use \v) you'll have the Perl/pcre behaviour on most special characters (excl. the vim specifics):

:s#\v\|#\\|#g