regular requirements are: lowercase letter beginning, + number / letter / minus sign, minimum 3 digits, maximum 16 digits .
I referred to some Baidu materials myself, and I was so close to ok. Now I have a small problem and I can"t tune it out.
/^[a-z][a-z1-9-]{3,16}$/
I typed 4 aeneries aaaa is not a match. This satisfies the minimum length of 3.
I typed 17 as, and they still match. Enter 19 a, which does not match.
should be 17 a, so it doesn"t match. Just false.
what"s going on with this? according to that expression, there doesn"t seem to be anything wrong, but it doesn"t work.