REGEX-Escape for: \/Android \(\[\.\_\\d\]\+\)\/\.exec\(a\)

Your Input:
Result, the escaped string:
\\\/Android \\\(\\\[\\\.\\_\\\\d\\\]\\\+\\\)\\\/\\\.exec\\\(a\\\)

What must the escaping look like for:
\/Android \(\[\.\_\\d\]\+\)\/\.exec\(a\)

The excaped text for use in a regex is:
\\\/Android \\\(\\\[\\\.\\_\\\\d\\\]\\\+\\\)\\\/\\\.exec\\\(a\\\)