Regex to accept numbers and can only accept one dot for decimals.

[pardhiv]

I am trying to write a regex with on change client and tried the below. It needs to accept numbers as below

ex: (should accept numbers and dots)

12345

12345.67

12345.678xxx (No limitation on decimals unless its not possible)

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
   if (isLoading || newValue === '') {
      return;
   }
   //Accept numbers with only dots
   var pattern =  /^(([0-9.]?)*)+$/;  
    if (!pattern.test(newValue)) {
		g_form.clearValue('u_amount');
        g_form.showFieldMsg('u_amount', 'Accepted format : 354621.32', 'error', true);
        
    } 
   
}

[Sandeep Rajput]

@pardhiv If you wish to have just one dot in the number and have numbers upto two decimal places then you can try the following regular expression.

/^(([0-9]+\.?[0-9]{2}?)*)+$/gm

It accepts following combinations.

1234

1234.12

Invalid combination

1234.123

1234.12.1

[Gangadhar Ravi]

try this 

^\d+(\.\d{1,2})?$

[Gangadhar Ravi]

try this 

^\d+(\.\d{1,2})?$