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Using bash regexp operator:
if [[ "$INPUT" =~ ^[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}$ ]]
then
echo "Valid"
else
echo "Invalid"...

Try:
n=2
sed "/\(.\)\(.*\1\)\{$n,\}/d" file.txt

awk > list3 'NR == FNR {
l2[FNR] = $0
fnr = FNR; next
}
{
for (i = 0; ++i <= fnr;)
print $0 l2[i]
}' list2 list1

$
$
$ cat f18
BD Address: 00:24:00:2C:00:76 [mode 1, clkoffset 0x27bc]
Device name: Nokia Test 0
Device class: Phone, Cellular (0x5a0204)
BD Address: 00:24:00:FB:00:9C [mode 1,...