What is a regular expression for a MAC Address

Question

In this format   3D F2 C9 A6 B3 4F   or   3D-F2-C9-A6-B3-4F

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A-Fa-f0-9  2   -   5     A-Fa-f0-9  2

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I don t think that the main RegEx is correct as it also classifies    3D-F2-C9 A6-B3 4F     as a valid MAC Address  even though it is not correct  The correct one would be       a-zA-z0-9  2  -    5   a-zA-z0-9  2       a-zA-z0-9  2    5   a-zA-z0-9  2       So that every time you can choose     or  -  for the whole MAC address

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the best answer is for mac address validation regex     0-9a-fA-F  0-9a-fA-F    5   0-9a-fA-F  0-9a-fA-F

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This one is a small one      0-9A-F  2   -    6     Have in mind  that weird mix of several chars or separators could pass

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This regex matches pretty much every mac format including Cisco format such as 0102-0304-abcd        xdigit    2    -    5    xdigit    2     Example strings which it matches   01 02 03 04 ab cd 01-02-03-04-ab-cd 01 02 03 04 ab cd 0102-0304-abcd 01020304abcd   Mixed format will be matched also

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to match both 48-bit EUI-48 and 64-bit EUI-64 MAC addresses     A h 2     -   h 2   5  z  A h 2     -   h 2   7  z    where  h is a character in  0-9a-fA-F   or     A 0-9a-fA-F  2     -   0-9a-fA-F  2   5  z  A 0-9a-fA-F  2     -   0-9a-fA-F  2   7  z    this allows  -  or     or no separator to be used

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delimiter       -       double or single  00   0  0f   f      0-9a-f  1 2     -   5   0-9a-f  1 2    i   or      0-9a-F  1 2     -   5   0-9a-F  1 2         exm  00 27 0e 2a b9 aa  00-27-0E-2A-B9-AA  0 27 e 2a b9 aa

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See this question also   Regexes as follows     0-9A-F  2   0-9A-F  2   0-9A-F  2   0-9A-F  2   0-9A-F  2   0-9A-F  2      0-9A-F  2 - 0-9A-F  2 - 0-9A-F  2 - 0-9A-F  2 - 0-9A-F  2 - 0-9A-F  2

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Be warned that the Unicode property  p xdigit  includes the FULLWIDTH versions  You might prefer  p ASCII Hex Digit  instead   The answer to the question asked might be best answered     provided you have a certain venerable CPAN module installed     by typing     perl -MRegexp  Common -lE  say  RE net  MAC     I show the particular pattern it outputs here as lucky pattern number 13  there are many others   This program      usr bin env perl use 5 010  use strict  use warnings qw lt FATAL all gt    my  mac rx   qr           amp MAC addr           DEFINE             lt MAC addr gt                     amp pair     lt it gt      amp either                       amp pair   k lt it gt     4                     amp pair                       lt pair gt      0-9a-f   2               lt either gt      -                  xi   while   lt DATA gt         chomp      printf   -25s  s n        gt    mac rx     ok     not ok         END   3D F2 C9 A6 B3 4F 3D F2 AC9 A6 B3 4F 3D F2 C9 A6 B3 4F 00  F2 C9 A6 B3 4F F2 C9 A6 B3 4F 3d f2 c9 a6 b3 4f 3D-F2-C9-A6-B3-4F 3D-F2 C9-A6 B3-4F   generates this output   3D F2 C9 A6 B3 4F         ok 3D F2 AC9 A6 B3 4F        not ok 3D F2 C9 A6 B3 4F 00      not ok  F2 C9 A6 B3 4F           not ok F2 C9 A6 B3 4F            not ok 3d f2 c9 a6 b3 4f         ok 3D-F2-C9-A6-B3-4F         ok 3D-F2 C9-A6 B3-4F         not ok   Which seems the sort of thing you re looking for

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This link might help you  You can use this      0-9A-Fa-f  2  -    5  0-9A-Fa-f  2      0-9A-Fa-f  4     2  0-9A-Fa-f  4

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A little hard on the eyes  but this           xdigit    2   -          xdigit    2  1  4    xdigit    2      will enforce either all colons or all dashes for your MAC notation    A simpler regex approach might permit A1 B2-C3 D4-E5 F6  for example  which the above rejects

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for PHP developer   filter var  value  FILTER VALIDATE MAC

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If you need spaces between numbers  like this variant  3D   F2   C9   A6   B3   4F   The regex changes to      0-9A-Fa-f  2   s  -   s  5   0-9A-Fa-f  2

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Maybe the shortest possible       da-f  2   -   5   da-f  2  i   Update  A better way exists to validate MAC addresses in PHP which supports for both hyphen-styled and colon-styled MAC addresses  Use filter var        Returns  macAddress  if it s a valid MAC address filter var  macAddress  FILTER VALIDATE MAC     As I know  it supports MAC addresses in these forms  x  a hexadecimal number    xx xx xx xx xx xx xx-xx-xx-xx-xx-xx xxxx xxxx xxxx

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Thanks a lot to  Moshe for the great answer above  After doing some more research I would like to add my extra findings  both in regards to IEEE 802 and enforcing consistent separator usage in regex      The standard  IEEE 802  format for printing MAC-48 addresses in   human-friendly form is six groups of two hexadecimal digits  separated   by hyphens -  It is however  widely adopted convention to also allow colon      and three groups of four hexadecimal digits separated by periods      Full credit to  Moshe here for his initial statement  and to  pilcrow for pointing out that IEEE 802 only covers hypens   Here is a regex that enforces that same separator is used throughout the mac address           0-9A-Fa-f  2      -        1 0-9A-Fa-f  2   5       Regex101 demo  And here is an additional one that allows for use of no separator at all           0-9A-Fa-f  2      -         1 0-9A-Fa-f  2   5       Regex101 demo

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As a MAC address can be 6 or 20 bytes  infiniband       the correct answer is      0-9A-Fa-f  2    5    0-9A-Fa-f  2    14     0-9A-Fa-f  2      you can replace   with   -    if you want different separators or none

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PHP Folks   print r preg match        0-9A-F  2       5     0-9A-F  2     i    00 25 90 8C B8 59       Need Explanation  http   regex101 com r wB0eT7

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a-fA-F0-9  2 -  5  a-fA-F0-9  2    a-fA-F0-9  2    5  a-fA-F0-9  2    0-9A-Fa-f  4     2  0-9A-Fa-f  4        The regex above validate all the mac addresses types below    01-23-45-67-89-ab 01 23 45 67 89 ab 0123 4567 89ab

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The python version could be   re compile r  A     da-f  2   -   5   da-f  2  Z  re I

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The standard  IEEE 802  format for   printing MAC-48 addresses in   human-friendly form is six groups of   two hexadecimal digits  separated by   hyphens - or colons      So      0-9A-Fa-f  2   -   5   0-9A-Fa-f  2

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You can use following procedure by passing mac address for validation   private static final String MAC PATTERN       0-9A-Fa-f  2   -   5   0-9A-Fa-f  2       private boolean validateMAC final String mac                 Pattern pattern   Pattern compile MAC PATTERN       Matcher matcher   pattern matcher mac       return matcher matches

[regex] What is a regular expression for a MAC Address?

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