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-F"_": using "_" as record separator variable
for (i=1;i<=NF;i++) :make a loop
if($i~/BL[0-9]+/) print $i : if $i contains patten "BL[0-9]+", which you want, then print it

awk -F"_" '{for(i=1;i<=NF;i++) if($i~/BL[0-9]+/) print $i}' file

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