I am struggling with a JavaScript regular expression error that Safari is giving me. I am trying to validate a domain, but for some reason, this specific part (?<!-) is causing the issue because the domain name should not end with a hyphen.
^((?!-)[A-Za-z0-9-]{1,63}(?<!-)\.)+[A-Za-z]{2,63}$
I believe the problem lies in Safari's lack of support for negative lookbehind, which is what's causing this specific error. I would really appreciate some assistance in solving this problem.
Your regex code
((?!-)[A-Za-z0-9-]{1,63}(?<!-)\.)+(?!-) works in JS ES5 compliant regex, the lookbehind (?<!-) is not supported there.
To address this issue, consider checking for a "-." sequence at the beginning of the string and failing the entire match if it is present:
^(?!.*-\.)(?:(?!-)[A-Za-z0-9-]{1,63}\.)+[A-Za-z]{2,63}$
^^^^^^^^^
For a more efficient approach that reduces performance concerns and backtracking, you can replace (?!.*-\.) with (?![^-]*(?:-(?!\.)[^-]*)*-\.). See another demo here.
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