Simple express router pattern matching

route_match.js

/**
 * Match request path with route style path.
 * 
 * @param {string} reqpath The request path
 * @param {string} routepath The route pattern path
 * @return {Object|boolean} matches object if match or false if not match
 *
 */
function match(reqpath, routepath) {
    if (reqpath === routepath) return {}
    let segments = reqpath.split('/').filter(Boolean);
    let route = routepath.split('/').filter(Boolean);
    let max = Math.max(segments.length, route.length);
    let matches = {}
    let ret;
    for (let i = 0; i < max; i++) {
        if (route[i] && route[i].charAt(0) === ':') {
            let param = route[i].replace(/(^:|[+*?]+$)/g, ''),
                flags = (route[i].match(/[+*?]+$/) || {})[0] || '',
                plus = ~flags.indexOf('+'),
                star = ~flags.indexOf('*'),
                val = segments[i] || '';
            if (!val && !star && (flags.indexOf('?') < 0 || plus)) {
                ret = false;
                break;
            }
            matches[param] = decodeURIComponent(val);
            if (plus || star) {
                matches[param] = segments.slice(i).map(decodeURIComponent).join('/');
                break;
            }
        } else if (route[i] !== segments[i]) {
            ret = false;
            break;
        }
    }
    return ret === false ? false : matches
}

// Example usage
const routes = [
  {
    path: '/',
    name: 'index',
  },
  {
    path: '/pages',
    name: 'pageList',
  },
  {
    path: '/page/:pagename',
    name: 'pageDetail',
  }
];

let path = '/page/some-page-name';

for(let i = 0; i < routes.length; i++) {
  let match = match(path, routes[i].path)
  if (match) {
    console.log(match, routes[i].name)
    break;
  }
}