How to use symbols || in mod_substitute (apache)?

Question

Apache HTTP Server

This module has a symbol | used as parameter separator.
And I just need to insert a line like this. a || b
I tried to use escaping by type a \|\| b- it does not work.

Answer 1

httpd.apache.org/docs/2.4/mod/mod_substitute.html As a
regex, only pattern is processed , while substitution is processed as a regular string, so you |can use it freely . needs to be shielded . Another option . s/pattern/a || b/
s/\Qa || b\E/abc/