How to apply currency validation to text box using a regular expression?

Question

Consider this form:

<form>
<input type="text" value="" placeholder="Enter no. of employee" oninput="this.value = this.value.replace(/[^0-9.]/g, '').replace(/(\..*)\./g, '$1');" required/>
<input type="text" value="" placeholder="Enter Salary" required/>
<input type="submit"/>
</form>

I want a regular expression validation for Enter salary text feild with following:

• The salary should be separated by commas like this format 1,00,000

• It should not take any other input except numbers like in the case of "Enter no. of employee" field

Answer 1

Here is the solution for my problem:

Indian currency:

onkeyup="this.value = this.value.replace(/\D/g, '').replace(/\B(?=(?:(\d\d)+(\d)(?!\d))+(?!\d))/g, ',');"

US Currency:

onkeyup="this.value = this.value.replace(/\D/g, '').replace(/\B(?=(\d{3})+(?!\d))/g, ',');"

Working solution:

<form>
    <input type="text" value="" placeholder="Enter no. of employee" oninput="this.value = this.value.replace(/[^0-9.]/g, '').replace(/(\..*)\./g, '$1');" required/>
    <input type="text" value="" placeholder="Enter Salary" onkeyup="this.value = this.value.replace(/\D/g, '').replace(/\B(?=(?:(\d\d)+(\d)(?!\d))+(?!\d))/g, ',');" placeholder="Enter Salary" required/>
    <input type="submit"/>
    </form>