Berkeley Electronic Press Selected Works. RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp). Supports JavaScript & PHP/PCRE RegEx. Results update in real-time as you type. Roll over a match or expression for details. Validate patterns with suites of Tests. Save & share expressions with others.

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

Grep Regex For Mac Address

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).

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.

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

Run it:

Unix Regular Expression Examples

Next, a string:

Run it:

Regex For Mac

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

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Regular expressions are sets of characters used to define search patterns. You can combine simple groupings of these characters to create sophisticated rules to find values within strings of text. Numbers 10.1 includes two regular expression functions, REGEX and REGEX.EXTRACT, which you can combine with these functions to search, match, and replace data in your tables:

FIND
SEARCH
SUBSTITUTE
TEXTAFTER
TEXTBEFORE
TEXTBETWEEN
COUNTMATCHES
AVERAGEIF
AVERAGEIFS
COUNTIF
COUNTIFS
IF
IFS

MINIFS
MAXIFS
SUMIF
SUMIFS
MATCH
XMATCH
LOOKUP
VLOOKUP
HLOOKUP
XLOOKUP

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Grep Regex For Mac Address

Unix Regular Expression Examples

Regex For Mac

Regex Editor

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