Some hints?  Go to the Training: RegexMini challenge

Can i get a little hint?

Read up on what that regex *really* means

Well, I know what it means<br>
but i cant find the correct syntax - could someone confirm that it still works?

It definitely still works.
hint for all php related challenges: rtfm

hi, i think the key is on: '/^[a-zA-Z]{1,16}$/'
because it should be like '/^[A-Za-z]{1,16}$/' so you can use more char types,
but it doesnt work, I was trying anything I thought, scape characters, string end but nothing works

One hint more: Read carefully the anchors part of sutugud player's link above

I am stuck at a probably really trivial step ... I think I know what needs to be done, but I have no idea how to enter it correctly. Problem: the php 'single quotes' mechanism. Searching the web for hours did not help, leaving me feeling extremely stupid. Can anyone give me a hint where to look? (sorry for the vague problem description, it is hard to be more explicit without spoilering)

Sound like you ar on a wro\ng track

is this Q about for Multiline Mode m modifier?
maybe about anchor ^ or $ with \n...??
hmm at first glance, how easy but not... preg_match <16 and strlen>16 seems to be core....
more work and study?

may do i use Ruby?? in ruby,In Ruby, the caret and dollar also always match at the start and end of each line.
hm.