How to "reveal" the escaping of a specific character?

Question

PHP

How to "reveal" the escaping of a specific character?
Ie, the line is given:
qwerty\|asdfg\\|zxcvb\`123\\\|456\\\789
It should, accordingly, be brought to the form:
qwerty|asdfg\|zxcvb\`123\456\\789
Ie . it is necessary to remove the escaping of the character |, taking into account the fact that the escaping character itself - \ - can be escaped.

Answer 1

https://stackoverflow.com/a/4298836/7283603