Regexp For Mac Address

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Regex09 Jan 2015 linuxMac address lookupMac

I need to mac address validation and I have to accept mac address without separator and with colon and dash separators. So valid formats like this. Aa:bb:cc:dd:ee:ff; aa-bb-cc-dd-ee-ff; aabbccddeeff; and mixed separators are invalid like this. Aa:bb-cc-dd:ee:ff; and the validation code with regex like this.

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MAC Address aka HWAddress is a unique identifier assigned to network interfaces.

The address can be accessed using ifconfig utility. It is a 12 digit hexadecimal number, spearated by 5 colons, with 2 digits in pair. The following regexp is the best validator I found.

Explaination

  • ^ and $ means start and end of the string respectively.
  • A hexadecimal string ranges from 0 to 9 and A to F.
  • The number of fitst hexadecimal pair and one colon is 5
  • The last hexadecimal pair has no colon

Example

Output

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Post #1,000 on this blog. Fitting that it’s Python nerd shit, huh?

Regex For Mac Address Python

I needed a way to search for MAC addresses, which are unique identifiers for networking hardware. For example, if your computer has a built-in Ethernet port, as well as wireless capability, then it has 2 MAC addresses. These are always 6 groups of 2 hexadecimal characters (0 through 9, and A through F). E.g., a valid MAC address would be: 01:98:DF:9E:10:37. Theoretically, every MAC address on every computer in the world will be unique, as the naming scheme provides over 281 trillion possible combinations (281,474,976,710,656).

Canonically these groups of 2 hex digits are separated by a colon, but many people record them with hyphens instead. So I needed to search for this particular pattern of characters amid a potentially-vast amount of text. Enter regular expressions (which I totally suck at using).

Mac Address Lookup

The regex I came up with is:

Going through it, piece by piece:
[a-fA-F0-9] = find any character A-F, upper and lower case, as well as any number
[a-fA-F0-9]{2} = find that twice in a row
[a-fA-F0-9]{2}[:|-] = followed by either a “:” or a “-” character (the backslash escapes the hyphen, since the hyphen itself is a valid metacharacter for that type of expression; this tells the regex to look for the hyphen character, and ignore its role as an operator in this piece of the expression)
[a-fA-F0-9]{2}[:|-]? = make that final “:” or “-” character optional; since the last pair of characters won’t be followed by anything, and we want them to be included, too; that’s a chunk of 2 or 3 characters, so far
([a-fA-F0-9]{2}[:|-]?){6} = find this type of chunk 6 times in a row

Let’s give it a shot.

Mac Address Changer

First, a list of strings… e.g., a row from a comma-delimited file (returned via the csv module):

Run it:

Mac Address Vendor Lookup

Next, a string:

Run it:

Fuckin’ bickety-bam, the whole stage comes crashing down.