import re


def compile_route(route):  # 编译路由串
    """ Compiles a route string and returns a precompiled RegexObject.

    Routes may contain regular expressions with named groups to support url parameters.
    Example: '/user/(?P<id>[0-9]+)' will match '/user/5' with {'id':'5'}

    A more human readable syntax is supported too.
    Example: '/user/:id/:action' will match '/user/5/kiss' with {'id':'5', 'action':'kiss'}
    """
    route = route.strip().lstrip('$^/ ').rstrip('$^ ')  # 字符串过滤字符.

    route = re.sub(r':([a-zA-Z_]+)(?P<uniq>[^\w/])(?P<re>.+?)(?P=uniq)', r'(?P<\1>\g<re>)', route)
    route = re.sub(r':([a-zA-Z_]+)', r'(?P<\1>[^/]+)', route)

    return re.compile('^/%s$' % route)