Discovering the position of digits within a string using Javascript

Question

Discovering the position of digits within a string using Javascript

Could someone help me find the positions of the numbers (1994 and 27) within this string?

I attempted to split the string but I'm unsure about how to proceed from there.

let str = 'year of birth: 1994, and i'm 27 yo'

javascript arrays string

Answer 1

Answer №1

Easy method for locating index

function locateIndex(str) {
        var number = /\d/;
        var numbers = str.match(number);
        return str.indexOf(numbers);
    }

console.log(locateIndex('The year is 2021'));//outputs 12

Answer 2

Easy method for locating index

function locateIndex(str) {
        var number = /\d/;
        var numbers = str.match(number);
        return str.indexOf(numbers);
    }

console.log(locateIndex('The year is 2021'));//outputs 12

Answer 3

Answer №2

Once the string has been divided, simply iterate through it and determine if each element is numeric or not.

let str = "year of birth : 1994 , and i'm 27 yo";
strArray = str.split(' ');
    for(let i=0;i<strArray.length;i++){
        //Check using isNaN() whether the element is a number.
        if(isNaN(strArray[i])==false){
            console.log("Number "+strArray[i]+" is at index "+i);
        }
    }

Answer 4

Once the string has been divided, simply iterate through it and determine if each element is numeric or not.

let str = "year of birth : 1994 , and i'm 27 yo";
strArray = str.split(' ');
    for(let i=0;i<strArray.length;i++){
        //Check using isNaN() whether the element is a number.
        if(isNaN(strArray[i])==false){
            console.log("Number "+strArray[i]+" is at index "+i);
        }
    }

Answer 5

Answer №3

If you're looking for a quick and convenient method, give the search() function a try.

Here's how it works:

str.search(regex);

In this syntax, str refers to the string you want to search within, and regex is what you're searching for.

The output: indicates the first occurrence index of your target element, such as a number in this case. You can then decide how to utilize this index, like slicing the string from that position.

To effectively use this method, it's vital to have a good grasp of regular expressions, which require some additional knowledge beyond the basic usage.

For instance:

let str = "year of birth : 1994 , and i'm 27 yo";
let reg = /\d/;
let ind = str.search(reg);
alert('the first instance of "'+reg+'" is found at index: ' + ind);
// The expected outcome here is 16 since it's where the number (1) appears in 1994;

// If you need to search for a specific number instead of any digit,
// adjust the reg variable accordingly. Let's find 94 for example..
reg = /94/;
ind = str.search(reg);
alert('the first instance of "'+reg+'" is found at index: ' + ind);

Answer 6

If you're looking for a quick and convenient method, give the search() function a try.

Here's how it works:

str.search(regex);

In this syntax, str refers to the string you want to search within, and regex is what you're searching for.

The output: indicates the first occurrence index of your target element, such as a number in this case. You can then decide how to utilize this index, like slicing the string from that position.

To effectively use this method, it's vital to have a good grasp of regular expressions, which require some additional knowledge beyond the basic usage.

For instance:

let str = "year of birth : 1994 , and i'm 27 yo";
let reg = /\d/;
let ind = str.search(reg);
alert('the first instance of "'+reg+'" is found at index: ' + ind);
// The expected outcome here is 16 since it's where the number (1) appears in 1994;

// If you need to search for a specific number instead of any digit,
// adjust the reg variable accordingly. Let's find 94 for example..
reg = /94/;
ind = str.search(reg);
alert('the first instance of "'+reg+'" is found at index: ' + ind);

Discovering the position of digits within a string using Javascript

Answer №1

Answer №2

Answer №3

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