Add backslash as escape character
Add backslash as escape character

Adds the character in front of the sequence to the search pattern.
Checks if the leading character is a backslash and doesn't substitute
the pattern in this case. If the leading character is no backslash or
doesn't exist, the pattern is replaced like before.

jbnicolai/envplate,kreuzwerker/envplate,kreuzwerker/envplate