javascript - How to use regex to match object key and replace with its value? - Stack Overflow

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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:

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

Thank you thank you thank you!

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./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!

• javascript
• javascript-objects

Share Improve this question Follow edited Apr 11, 2018 at 4:16 wp78de 19k77 gold badges4646 silver badges7777 bronze badges asked Apr 10, 2018 at 15:03 PepperAddictPepperAddict 1,02822 gold badges1111 silver badges1919 bronze badges 2

• Object.keys(state).forEach(k => str = str.replace(k, state[k])) – Ele Commented Apr 10, 2018 at 15:05
• You live in ${arrayOfStates['NY']} – Joe Warner Commented Apr 10, 2018 at 15:07

Add a ment  | 

4 Answers 4

Sorted by: Reset to default 2

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);

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())

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))

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"

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