Regex check returns false in JavaScript

Question

I'm trying to create a regex for the following pattern:-

1234,4321;5678,8765;1234,4321;5678,8765;1234,4321;5678,8765;

/[0-9]+,[0-9]+;/g or /\d+,\d+;/g doesn't seem to work in JavaScript.

Output:-

false

function myFunction() {
  var str = "1234,4321;1234,4321;1234,4321;1234,4321;";
  var patt = new RegExp(/[0-9]+,[0-9]+;/g);
  var res = patt.test(str);
  document.getElementById("demo").innerHTML = res;
}

myFunction()

<div id="demo"></div>

define "doesn't seem to work" pls. Regex.test returns a boolean indicating if there are matches or not. it doesn't return actual matches. Use String.match() for that — nozzleman
– nozzleman, Commented Jan 20, 2017 at 6:25

Ashutosh Tripathi · Accepted Answer · 2017-01-20 06:33:36Z

1

Your just need one correction. i.e., pass the global flag g as a second parameter to RegExp constructor.

function myFunction() {
var str = "1234,4321;1234,4321;1234,4321;1234,4321;";
var patt = new RegExp(/[0-9]+,[0-9]+;/, 'g');
var res = patt.test(str);
document.getElementById("demo").innerHTML = res;
}

answered Jan 20, 2017 at 6:33

Ashutosh Tripathi

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1 Comment

Rajesh Dixit Over a year ago

OP's code is just fine. Sample. global flag is retained

Hemanth K · Accepted Answer · 2017-01-23 20:38:42Z

1

Using the RegEx /^([0-9]+:[0-9]+,)*$/ solves the problem. ()star makes sure the pattern matches every time.

function myFunction() {
  var str = "1234,4321;1234,4321;1234,4321;1234,4321;";
  var patt = new RegExp(/^([0-9]+:[0-9]+,)*$/);
  var res = patt.test(str);
  document.getElementById("demo").innerHTML = res;
}

myFunction()
<div id="demo"></div>

answered Jan 23, 2017 at 20:38

Hemanth K

516 bronze badges

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