I have string such as 12 3 44 5 \n 7 88
I want get from string only numbers and write them in array: [12,3,4,5,7,88].
I want do it whith RegExp:
var str='12 3 44 5 \n 7 88';
alert(str);
var re =/^\S+$/;
var res=re.exec(str);
alert(res[0]);
alert(res[1]);
alert(res[2]);
But it doesn't work for me.
Correct way:
var str = '12 3 44 5 \n 7 88';
//if there matches, store them into the array, otherwise set 'numbers' to empty array
var numbers = str.match(/\d+/g)?str.match(/\d+/g):[];
//to convert the strings to numbers
for(var i=0;i<numbers.length;i++){
numbers[i]=+numbers[i]
}
alert(numbers);Why? .match() is just an easier thing to use there. \d+ gets a number of any length, flag g returns all the matches, not only the first match.
If you also want to match the floats, the regex would be /\d+([\.,]\d+)?/g. It'll also match 42,12 or 42.12.
var numbers = str.match(/\d+/g).map(Number);.
parseInt? I'm converting to number with +, seems to be shorter.A possible alteranative
var s = '12 3 44 5 \n 7 88';
var numbers = s.split(/[^\d]+/).map(Number);
document.getElementById('out').textContent = JSON.stringify(numbers);
console.log(numbers);<pre id="out"></pre>With split you will never have a situation like where exec or match could be null
Note: this does not take into account negative numbers or floating point or scientific numbers etc. An empty string will also produce [0], so specification is key.
