I need to allow user to only enter integer (33) and float (33.343) in a textbox.

Below is my Regex Query but it is not working fine. It is allowing the user to enter float values but giving error on int values.but i need to allow user to enter int also. It is working fine and giving error message when user enter any other type of value.

/^[0-9]*[.][0-9]*$/

I need to allow user to only enter integer (33) and float (33.343) in a textbox.

Below is my Regex Query but it is not working fine. It is allowing the user to enter float values but giving error on int values.but i need to allow user to enter int also. It is working fine and giving error message when user enter any other type of value.

/^[0-9]*[.][0-9]*$/

• javascript
• regex
• string

3 Answers 3

Make dot and the part after it optional:

"^\d+(?:\.\d+|)$"

Also prefer \d over [0-9], don't use * since then you allow the possibility of no number either side of the .

This will accept:

1
1.23

but not:

.1
23.

It's up to you if you want that behaviour.

Try with:

/^[0-9]+(?:\.[0-9]+)?$/

Use regex pattern

^(?=.*\d)\d*(?:\.\d*)?$

This will match for example:

1234
123.
1.23
12.3
0.12
.123