Oh!
Then we're only missing the alternating hyphen and it's done.
^[a-z](-[a-z0-9])?([a-z0-9]-[a-z0-9]|[a-z0-9])*([a-z0-9]-)?[a-z0-9](?:\.[a-z](-[a-z0-9])?([a-z0-9]-[a-z0-9]|[a-z0-9])*([a-z0-9]-)?[a-z0-9])*$
More tests:
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How about
Alternating hyphens wouldn't work either
Further testing:
How about
Over eager in matching that last character. I should actually put your test cases into a tester before throwing this out there haha... I'll do that next time I swear.
I did it! You weren't far! You just had to delete the first character acceptance in your last .-., since the previous section already ended in letter/number.
^[a-z](-[a-z0-9](-[a-z0-9])*)?(-[a-z0-9]|[a-z0-9])*(?:\.[a-z](-[a-z0-9](-[a-z0-9])*)?(-[a-z0-9]|[a-z0-9])*)*$Now wondering if it's possible to add a maximum number of characters in this regex.
Working the same way as before.
^[a-z](-[a-z0-9](-[a-z0-9])*)?([a-z0-9]-[a-z0-9]|[a-z0-9])*(?:[a-z](-[a-z0-9](-[a-z0-9])*)?([a-z0-9]-[a-z0-9]|[a-z0-9])*)$My bad, it actually works better
^[a-z](-[a-z0-9](-[a-z0-9])*)?([a-z0-9]-[a-z0-9]|[a-z0-9])*(?:[a-z](-[a-z0-9](-[a-z0-9])*)?([a-z0-9]-[a-z0-9]|[a-z0-9])*)*$It's actually working pretty well. I had just missed a period.
but it's still missing a test case.
Further testing:
And more tests:
& more