Using Regular Expression to Validate a Decimal Number

One of my clients had a requirement where a decimal input could not exceed 5,2 characters. In other words, the integral part of the decimal could not exceed more than 5 digits and the fractional part could not exceed more than 2 digits.

Eg: 99999.22 where 99999 is integral part and 22 is fractional

Here’s how to solve this requirement using a Regular expression:

<asp:TextBox ID="txtN" runat="server"></asp:TextBox>
<
asp:RegularExpressionValidator id="myRegex" runat="server"
ControlToValidate="txtN" ValidationExpression="^[0-9]{1,5}(\.[0-9]{0,2})?$"
ErrorMessage="Decimal out of range" />

The expression ^[0-9]{1,5}(\.[0-9]{0,2})?$ checks if the integral part is between 1 to 5 digits and the fractional part is between 0 to 2 digits. Here are some tests.

Decimal Regex



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About The Author

Suprotim Agarwal
Suprotim Agarwal, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.

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