如何使用正则表达式匹配对象键并替换为其值？

Question

I'm still new with Javascript and I'm not entirely sure how to go about this.

I want it to match the key field and replace it with its value.

const state = {
"NY": "New York"
}

You live in NY to You live in New York

The list is going to be quite long with all the states so I think I'll have to use objects. Any help would be appreciated! Thank you in advance!

EDIT>>>

Thank you so much to those that replied! I made a list of all the states for USA, Canada, and Mexico to their full name here: https://gist.github.com/PepperAddict/b8c6c80af4a17908fd98378b4375047e

using the code that was provided, I was able to change them all to their full name.

Thank you thank you thank you!

Answer 1

You don't need regex, use the keys from the object state

Object.keys(state).forEach(k => str = str.replace(k, state[k]));

 const state = { "NY": "New York" }; var str = "You live in NY"; Object.keys(state).forEach(k => str = str.replace(k, state[k])); console.log(str); 

Using regex to replace the whole set of matches:

 const state = { "NY": "New York" }; var str = "You live in NY and again in NY"; Object.keys(state).forEach(k => str = str.replace(new RegExp(`\\\\b${k}\\\\b`, 'g'), state[k])); console.log(str); 

Answer 2

We can make use of template literals and map it will return an array which you can then do what you want with.

 const state = { "NY": "New York" } console.log(Object.keys(state).map(s => `You live in ${state[s]}`)) 

If you're planning to do this with a user for example

---

 const state = { "NY": "New York" } const user = { name: "joe", state: "NY", liveIn: () => `You live in ${state[user.state]}` } console.log(user.liveIn()) 

Answer 3

if you are sure the last word is key . Then you can skip foreach by following.

const state = {
"NY": "New York"
}

var a = "You live in NY";

b = a.split(" ");

b = b[b.length - 1];


a.replace(b, state[b]);

Console.log(a); 

Output

"You live in New York"

Answer 4

 const states = { "CA": "California", "NY": "New York" } var input = "I'm from CA, thinking of moving to NY but not sure, I still really like CA." var regexStr = Object.keys(states).join("|") var statesRgx = new RegExp(`\\\\b(${regexStr})\\\\b`, 'g') console.log(statesRgx) function stateReplace(str){ return str.replace(statesRgx, val => states[val]) } console.log(stateReplace(input))