short formulas:
=REGEXEXTRACT(A1;"_1""\: ""(.{5})")
=REGEXEXTRACT(A1;"_1""\: (.{7})")
=REGEXEXTRACT(A1;"rev2_1""\: ""(.{5})")
=REGEXEXTRACT(A1;"rev2_1""\: (.{7})")
=REGEXEXTRACT(A1;"rev2_1""\: ""(.+)\"", ""rev2_2")
=REGEXEXTRACT(A1;"rev2_1""\: (.+)\, ""rev2_2")
=REGEXEXTRACT(A1;"_1""\: ""(.+)\"", ""rev2_2")
=MID(A1;32;5)

this will search for what is in A5 cell:
=REGEXEXTRACT(FILTER(
TRANSPOSE(SPLIT(SUBSTITUTE(A1; ", "; "×"); "×")); ISNUMBER(SEARCH("*"&A5&"*";
TRANSPOSE(SPLIT(SUBSTITUTE(A1; ", "; "×"); "×"))))); ": (.+)")

to remove doublequotes:
=SUBSTITUTE(REGEXEXTRACT(FILTER(
TRANSPOSE(SPLIT(SUBSTITUTE(A1; ", "; "×"); "×")); ISNUMBER(SEARCH("*"&A5&"*";
TRANSPOSE(SPLIT(SUBSTITUTE(A1; ", "; "×"); "×"))))); ": (.+)"); """"; "")

to convert it on number:
=VALUE(SUBSTITUTE(SUBSTITUTE(REGEXEXTRACT(FILTER(
TRANSPOSE(SPLIT(SUBSTITUTE(A1; ", "; "×"); "×")); ISNUMBER(SEARCH("*"&A5&"*";
TRANSPOSE(SPLIT(SUBSTITUTE(A1; ", "; "×"); "×"))))); ": (.+)"); """"; ""); ","; "."))

or:
=REGEXEXTRACT(SUBSTITUTE(REGEXEXTRACT(FILTER(
TRANSPOSE(SPLIT(SUBSTITUTE(A1; ", "; "×"); "×")); ISNUMBER(SEARCH("*"&A5&"*";
TRANSPOSE(SPLIT(SUBSTITUTE(A1; ", "; "×"); "×"))))); ": (.+)"); ","; ""); "\d+")
