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10-regular-expressions-javascript/12-regexp-anchors/2-test-mac/solution.md

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+A two-digit hex number is `pattern:[0-9a-f]{2}` (assuming the `pattern:i` flag is enabled).
+
+We need that number `NN`, and then `:NN` repeated 5 times (more numbers);
+
+The regexp is: `pattern:[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 `pattern:^...$`.
+
+Finally:
+
+```js run
+let reg = /^[0-9a-fA-F]{2}(:[0-9a-fA-F]{2}){5}$/i;
+
+alert( reg.test('01:32:54:67:89:AB') ); // true
+
+alert( reg.test('0132546789AB') ); // false (no colons)
+
+alert( reg.test('01:32:54:67:89') ); // false (5 numbers, need 6)
+
+alert( reg.test('01:32:54:67:89:ZZ') ) // false (ZZ in the end)
+```

10-regular-expressions-javascript/12-regexp-anchors/2-test-mac/task.md

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+# Check MAC-address
+
+[MAC-address](https://en.wikipedia.org/wiki/MAC_address) of a network interface consists of 6 two-digit hex numbers separated by a colon.
+
+For instance: `subject:'01:32:54:67:89:AB'`.
+
+Write a regexp that checks whether a string is MAC-address.
+
+Usage:
+```js
+let reg = /your regexp/;
+
+alert( reg.test('01:32:54:67:89:AB') ); // true
+
+alert( reg.test('0132546789AB') ); // false (no colons)
+
+alert( reg.test('01:32:54:67:89') ); // false (5 numbers, must be 6)
+
+alert( reg.test('01:32:54:67:89:ZZ') ) // false (ZZ ad the end)
+```