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