val c = this[i]
        if (c == '\\' || c == '/') {
          slashCount++
        } else {
          break
        }
      }
      return slashCount
    }

    /** Finds the first ':' in `input`, skipping characters between square braces "[...]". */
    private fun portColonOffset(
      input: String,
      pos: Int,
      limit: Int,
    ): Int {
      var i = pos