Today I needed a regex in order to validate a
MAC address field from a form. The other responses in this
thread are excellent, but here's another alternative for
this task:
^(?:[[:xdigit:]]{1,2}[-:]){5}[[:xdigit:]]{1,2}$
I wanted to allow
a user to type in a:b:c:d:e:f instead of 0a:0b:0c:0d:0e:0f,
hence the {1,2} quantifiers. Using the POSIX character class
:xdigit: tidies things up and makes it obvious what input is
required, which helps document the code. I liked petdance's
solution ( ++), but didn't use it because in my application I
only wanted to allow ':' as the separator.
Thanks to the helpful CB people who assisted me with this:
blakem, demerphq, davorg & Petruchio.
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