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MAC-address of a network interface consists of 6 two-digit hex numbers separated by a colon.
For instance: '01:32:54:67:89:AB'
.
Write a regexp that checks whether a string is MAC-address.
Usage:
let
regexp =
/
your regexp
/
;
alert
(
regexp.
test
(
'01:32:54:67:89:AB'
)
)
;
// true
alert
(
regexp.
test
(
'0132546789AB'
)
)
;
// false (no colons)
alert
(
regexp.
test
(
'01:32:54:67:89'
)
)
;
// false (5 numbers, must be 6)
alert
(
regexp.
test
(
'01:32:54:67:89:ZZ'
)
)
// false (ZZ at the end)
A two-digit hex number is [0-9a-f]{2}
(assuming the flag i
is set).
We need that number NN
, and then :NN
repeated 5 times (more numbers);
The regexp is: [0-9a-f]{2}(:[0-9a-f]{2}){5}
Now let’s show that the match should capture all the text: start at the beginning and end at the end. That’s done by wrapping the pattern in ^...$
.
Finally: