Regular expression is not working properly in javascript

Question

I am doing amount validation. The requirements are:

There should not be a leading zero.
It should accept only numbers.
There should be a single decimal point.
it should accept 9 digits before decimal and 2 digits after decimal.

I have tried this regex:

/^(([1-9]\d{0,8})(\.\d{1,2})?)/g;

The issue is, after entering 9 digits, decimal is getting entered only if you enter any digits along with it simultaneously (at a time), without it I am unable enter decimal point.

You want to be able to enter a decimal without a number following it? — brso05
– brso05, Commented Feb 17, 2016 at 18:25
yes absolutely .. not simultaneously.First i should be able to enter decimal point,then the numbers — Aishwarya
– Aishwarya, Commented Feb 17, 2016 at 18:27

emartinelli · Accepted Answer · 2016-03-01 12:52:04Z

1

This could help:

/^(?!0)\d{1,9}\.\d{0,2}$/

In this case, I used a lookahed ((!?0)) to prevent a leading zero, then used a similar OP expression to match the string. It means that everything in expression \d{1,9}\.\d{0,2} and not preceded by a zero will be matched.

Demo

edited Mar 1, 2016 at 12:52

answered Feb 17, 2016 at 19:03

emartinelli

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