# Functions
IsWell 检测格式是否正确.
NewSegment 声明新的 Segment 变量.
Split 将字符串解析成字符串数组
以 { 为分界线进行分割。比如 /posts/{id}/email ==> /posts/, {id}/email /posts/\{{id}/email ==> /posts/{, {id}/email /posts/{year}/{id}.html ==> /posts/, {year}/, {id}.html.
# Type aliases
Type 路由项的类型.