在红宝石中解析 [英] parsing in ruby

问题描述

我有这个Hash:

cookie = {"fbs_138415639544444"=>["\"access_token=138415639544444|5c682220fa7ebccafd97ec58-503523340|9HHx3z7GzOBPdk444wtt&expires=0
&secret=64aa8b3327eafbfd22ba070b&session_key=5c682220fa7dsfdsafas3523340
&sig=4a494b851ff43d3a58dfa8757b702dfe&uid=503523340\""], 
"_play_session"=>["fdasdfasdf"]}

我需要从access_token=之后到&expires之前的子字符串.问题在于，键fbs_138415639544444中的数字每次都会更改，只是部分fbs_保持不变.

I need to get the substring from right after access_token= to right before &expires. The problem is that the number in the key fbs_138415639544444 changes every time, just the part fbs_ remains constant.

任何想法如何获得:

"138415639544444|5c682220fa7ebccafd97ec58-503523340|9HHx3z7GzOBPdk444wtt"

推荐答案

这是解码HTML URL中的参数和查询时的常见任务.这是将参数分解为哈希的一种小方法.从那里很容易获得您想要的价值:

This is a common task when decoding parameters and queries in HTML URLs. Here's a little method to break down the parameters into a hash. From there it's easy to get the value you want:

def get_params_hash(params)
  Hash[ *params.split('&').map{ |q| q.split('=') }.flatten ]
end

p get_params_hash(cookie['fbs_138415639544444'].first)['"access_token']

# >> "138415639544444|5c682220fa7ebccafd97ec58-503523340|9HHx3z7GzOBPdk444wtt"

在Ruby 1.9+中，哈希保留其插入顺序，因此，如果哈希始终具有您想要的值作为其第一项，则可以使用

In Ruby 1.9+, hashes retain their insertion order, so if the hash always has the value you want as its first entry, you can use

cookie.keys.first #=> "fbs_138415639544444"

否则使用:

cookie.keys.select{ |k| k[/^fbs_/] }.first #=> "fbs_138415639544444"

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