Parsing a String looking characters

Question

I am trying to extract the numbers of this string: "ax(341);ay(20);az(3131);"

I think that I can do it how this:

var ax = data.split('(');
var ax2 = ax[1].split(')');

ax2[0] has "341"

Now If I can repeat this but starting in the next indexOf to take the second number.

I think that it's a bad practice, so I ask you If you have a better idea.

Thanks in advance

use regexp see here http://stackoverflow.com/questions/13807207/regex-find-a-number-between-parentheses — Mritunjay, Aug 29 '14 at 10:23

Andy · Accepted Answer · 2014-08-29T10:40:19.057

4

Use a regular expression:

var str = "ax(-341);ay(20);az(3131);"
var regex = /(-?\d+)/g
var match = str.match(regex);
console.log(match); // ["-341", "20", "3131"]

Now you can just access the numbers in the array as normal.

DEMO

edited Aug 29 '14 at 10:40

answered Aug 29 '14 at 10:25

Andy

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Numbers can be negative, how this pattern? – oscarvady Aug 29 '14 at 10:38

nisargjhaveri · Answer 2 · 2014-08-29T10:32:06.497

1

You can use regex to extract all numbers from this.

var data = "ax(341);ay(20);az(3131);";
var ax = data.match(/\d+/g);

Here ax is now ["341", "20", "3131"]

Note that ax contains numbers as string. To convert them to number, use following

ax2 = ax.map( function(x){ return parseInt(x); } )

EDIT: You can alternatively use Number as function to map in the line above. It'll look like,

ax2 = ax.map( Number )

After this ax2 contains all the integers in the original string.

edited Aug 29 '14 at 10:32

answered Aug 29 '14 at 10:24

nisargjhaveri

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you could just say `ax2 = ax.map(parseInt)` – Mritunjay Aug 29 '14 at 10:26
No. You cannot. It gives some strange result. Try out. For me it gave [341, NaN, NaN]. See [this](http://stackoverflow.com/questions/262427/javascript-arraymap-and-parseint) – nisargjhaveri Aug 29 '14 at 10:27
That will give an error because `parseInt` uses a second parameter as a radix. Better to use `Number`: `ax2 = ax.map(Number)` – Andy Aug 29 '14 at 10:27
@Andy ya I would have used `Number` only, but in answer `parseInt` is being used that's why I put it just like that. – Mritunjay Aug 29 '14 at 10:28
Thank you for the suggestion. `Number` seems better then `parseInt` in this case. – nisargjhaveri Aug 29 '14 at 10:30
You should include the radix in your `parseInt`: `parseInt(x, 10);`. – Andy Aug 29 '14 at 10:46

score 0 · Answer 3 · answered Aug 29 '14 at 10:25

0

You could use a regular expression, eg:

var string = 'ax(341);ay(20);az(3131);';
var pattern = /([0-9]{1,})/g;

var result = string.match(pattern);
console.log(result);
//  ["341", "20", "3131"]

http://regex101.com/r/zE9pS7/1

answered Aug 29 '14 at 10:25

SubjectCurio

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Parsing a String looking characters

3 Answers3