router.js

const pathToRegExp = require('path-to-regexp');

const repo = {
    index: pathToRegExp('/repos/:organization/:dir/:name'),
    blob: pathToRegExp('/repos/:organization/:dir/:name/blob/:path+')
};

const legacyRepo = {
    index: pathToRegExp('/repos/:organization/:dir/:name/:extra+'),
    blob: pathToRegExp('/repos/:organization/:dir/:name/:extra+/blob/:path+')
};

// 所有非三级结构的库中不会含有tree和blob这2个关键字，也就是说从第4级开始是不会有blob或者tree的，
// 那么将前3级写死，后面部分全部给extra就能保证/:extra+/blob和/:extra+/tree的匹配没有任何歧义

console.log(repo.index.exec('/repos/baidu/icode/frontend-v2'));
console.log(repo.blob.exec('/repos/baidu/icode/frontend-v2/blob/src/common/components/index.js'));

console.log(legacyRepo.index.exec('/repos/asop/android/platform/native/bridge'));
console.log(legacyRepo.blob.exec('/repos/asop/android/platform/native/bridge/blob/src/Main.java'));

// 当前存在第3级是tree或blob的库
console.log(repo.index.exec('/repos/baidu/zhangdi07/blob')); // 能匹配
console.log(repo.blob.exec('/repos/baidu/zhangdi07/blob/blob/src/Main.java')); // 能匹配
console.log(legacyRepo.index.exec('/repos/baidu/zhangdi07/blob')); // 不应该匹配
console.log(legacyRepo.blob.exec('/repos/baidu/zhangdi07/blob/blob/src/Main.java')); // 不应该匹配