CODEWITHSUNDEEP
javascript
Miguel Moura
Miguel Moura

Reputation: 39384

Match string in text after last dot

I have the following strings:

var a = "vm.model.password";
var b = "vm.model.passwordCheck";

And I have the following:

var sa = "Password";
var sb = "PasswordCheck";

I need to check that sa is contained in a and sb in b.

So to compare I need to check the string in a or b after the dot. And check if the sa is equal to that string but making the first letter of sa to lowercase first.

I was doing something like:

a.indexOf(sa.toLowerCase()) > -1;

But the problem is that sa would be a match of b to and sb would not be a match for b because it starts with P and not p.

What is the best way to do this?

Upvotes: 1

Views: 967

Answers (5)

ManoDestra
ManoDestra

Reputation: 6473

Something like...

var a = "vm.model.password";
var b = "vm.model.passwordCheck";

var sa = "Password";
var sb = "PasswordCheck";

var endA = a.substring(a.lastIndexOf('.') + 1).toLowerCase();
var endB = b.substring(a.lastIndexOf('.') + 1).toLowerCase();

if (endA.includes(sa.toLowerCase())) {
    alert("A match");
}

if (endB.includes(sb.toLowerCase())) {
    alert("B match");
}

Obviously, you should check that it contains a '.' or that the lastIndexOf result is >= 0, etc, but I've avoided such validations for simplicity here.

Upvotes: 1

omarjmh
omarjmh

Reputation: 13886

As far as getting the last word:

what about using str.lastIndexOf('.') which is much faster than split():

var a = "vm.model.password";
var b = "vm.model.passwordCheck";

console.log(a.slice(a.lastIndexOf('.') + 1))
// a .toLowerCase at the end should do it

JSbin: https://jsbin.com/komowi/edit?js,console

Given how you are running into problems with uppercase/lowercase letters it might be time to look at a RegExp which has an 'i' flag on it which means it will match with caseMDN RegExp This isnt needed per say, but surely will help down the road

Upvotes: 4

Denny Mathew
Denny Mathew

Reputation: 1132

How about this:

a.toLowerCase().split('.').pop() === sa.toLowerCase()

b.toLowerCase().split('.').pop() === sb.toLowerCase()

Upvotes: 1

Castillo
Castillo

Reputation: 145

With pop() you get the last element of the array. 

if( sa.toLowerCase() == a.split(".").pop() ){
 //your code here
}

Upvotes: 1

kockburn
kockburn

Reputation: 17616

You could do something like this, if the word you want to check is always at the end.

var aArray = a.split(".");
sa.toLowerCase() === aArray[aArray.length-1].toLowerCase();

Upvotes: 1

Related Questions