CODEWITHSUNDEEP
javascriptregex
Hemanth K
Hemanth K

Reputation: 51

Regex check returns false in JavaScript

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>

Upvotes: 1

Views: 82

Answers (2)

Hemanth K
Hemanth K

Reputation: 51

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>

Upvotes: 1

Ashutosh Tripathi
Ashutosh Tripathi

Reputation: 242

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;
}

Upvotes: 1

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