try:
=SUBSTITUTE(SUBSTITUTE(REGEXEXTRACT(
REGEXEXTRACT(A1, "bing.com(.+)"), "http[^&]+"), "%3a", ":"), "%2f", "/")
и для массива:
=ARRAYFORMULA(IFNA(SUBSTITUTE(SUBSTITUTE(REGEXEXTRACT(
REGEXEXTRACT(A20:A21, "bing.com(.+)"), "http[^&]+"), "%3a", ":"), "%2f", "/")))