Getting integers from a string using JavaScript

Question

I am trying to extract the integers from a string.

String :

Str = "(Start = 10) AND (End_ = 40)"

Note: The integers here can range from 1 - 999, single digit to three digits

Desired Output:

No1 = 10
No2 = 40

Please show your attempt(s). What isn't working in your code? — castletheperson
– castletheperson, Commented Nov 28, 2018 at 1:08
Thank you for your quick response. Here is my attempt: var clause = "(Start = 231) AND (End_ = 24)"; var s_node,e_node, cnt=0; for(i=0; i< clause.length; i++){ var a = parseInt(clause[i]); if(Number.isInteger(a)) { if(cnt == 0){ s_node = a; cnt++ } else{ e_node = a; } } } console.log(s_node, e_node) This works if I have single digit integer within a string. Works if, var clause = "(Start = 1) AND (End_ = 4)" fails if, var clause = "(Start = 231) AND (End_ = 24)" — Mayur Shinde
– Mayur Shinde, Commented Nov 28, 2018 at 1:15
Note that 1-3 digits are not enough to describe the problem, since 20455 will also match. You'd need to add a boundary condition or two. — user557597
– user557597, Commented Nov 28, 2018 at 1:34

AnonymousSB · Accepted Answer · 2018-11-28 02:06:01Z

2

This code will get you what you want, an array of numbers found in the string.

Explanation

The regular expression looks for a single number 1 through 9 [1-9] followed by 0, 1, or 2 {0,2} numbers between 0 through 9 [0-9]. The g means global, which instructs match() to check the entire string and not stop at the first match.

Code

var str = "(Start = 10) AND (End_ = 40)";
var numbers = str.match(/[1-9][0-9]{0,2}/g);

console.log(numbers);

edited Nov 28, 2018 at 2:06

answered Nov 28, 2018 at 1:18

AnonymousSB

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7 Comments

AnonymousSB Over a year ago

Updated the regular expression to NOT capture 0, or any number prefixed by 0.

Mayur Shinde Over a year ago

There wont be "0" in the main string however, I can make the changes accordingly.

user557597 Over a year ago

single digit to three digits so can it start with 0 like 001 ?

Mayur Shinde Over a year ago

@sln, No it will not have 0. eg: 1,2,3,.......,11,12,.......,111,...,999

AnonymousSB Over a year ago

Cool, then the updated regex will work perfectly for you.

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