regular expression for validating fields

Question

Validations i'm trying :

regular expression of : 9999.99 and no spaces (0009.99 it should convert 9.99

Edit :

var regex = '(?!0)\d+(?:\.\d+)?$';

function getValue()  {
    // passing value 0009.99 and 0009.00 and 100
    return document.getElementById("myinput").value;

}

function test() {
    alert(regex.test(getValue()));
}

function match() {
    alert(getValue().match(regex));    
}

https://stackoverflow.com/q/8276451/1596138 – Sep 26 '18 at 14:51 — , Sep 26 '18 at 14:51

Poul Bak · Answer 1 · 2018-09-26T22:41:29.213

4

Your first and second seems to Work just fine, the third can be achieved with the following regex:

/(?!0)\d+\.\d+$/

It starts by looking forward for zeros (skipping them), then it matches any number of digits followed by a dot and more digits. If you want the digits to be optional you can replace the plus '+' with a star '*'.

Edit:

If you want to allow integers, you can use this regex:

/(?!0)\d+(?:\.\d+)?$/

That makes the dot and the digits after that optional.

BTW: Your jsfiddle does not help in answering.

Edit2:

To create a Regex using quotes you must use the following syntax:

var regex = new RegExp('(?!0)\d+(?:\.\d+)?$');

Edit3:

I forgot to mention, you need to double escape backslashes, it should be:

var regex = new RegExp('(?!0)\\d+(?:\\.\\d+)?$');

Now it should Work directly in your code.

edited Sep 26 '18 at 22:41

answered Sep 25 '18 at 17:53

Poul Bak

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https://jsfiddle.net/u6Lctkw9/1/ - it is not working ! i wanted to add only "12" price. – Var Sep 26 '18 at 14:36
that regular expression is not working in angular/javascript. what do you recommend? – Var Sep 26 '18 at 15:08
Sure it does, just make sure you don't quote the regex when you use slashes. – Poul Bak Sep 26 '18 at 15:26
What's the problem? It matches the number as it should skipping the zeros. – Poul Bak Sep 27 '18 at 15:23

regular expression for validating fields

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