javascript - Regular expression for int and float both not working fine - Stack Overflow

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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

Share Improve this question Follow edited May 23, 2018 at 15:23 Ωmega 43.7k3535 gold badges142142 silver badges212212 bronze badges asked Oct 18, 2012 at 12:43 Asp_NewbieAsp_Newbie 26922 gold badges99 silver badges1717 bronze badges 0

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3 Answers 3

Sorted by: Reset to default 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

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