For reference, something like like this (Python regex):

  ^[a-zA-Z_]+[a-zA-Z0-9_]*(-?[a-zA-Z0-9_]+)*$

  some-name
  some2-name
  some-2-name
  some-2name
  some-name2
  some-name-2
  some2other-name
  some-other2name
  some-othername2
  some-2othername
  some-0-other-name
  a-0-name
  a0-0a-0a-a0
  kebab-case-pls
  tbh-didnt-write-any-underscore-tests

  -negated
  -negated-variable
  -(negated)
  -(also-negated)
  -(-double-negated)
  binary - operation
  binary + operation
  double - binary - operation

  2-syntax-error-4-me
  2syntaxerrorforme
  1-2-3-4-syn-tax-err-or
  80086-syntax-error
  syntax+error
  syntaxerror+
  syntax-error+
  syntax-error-
  syntax-(error)
  (syntax)-error
  syntax--error
  syntax++error