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Editorial Team
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Asked: 2026-05-24T07:03:51+00:00

I’ve got a regular expression that I’m using for validating a decimal type number

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I’ve got a regular expression that I’m using for validating a decimal type number in .NET.

Current Regular Expression

 [-+]?[0-9]*\.?[0-9]+

(EDIT – My problem was due to the Regular Expression [-+]?[0-9]*\.?[0-9]: I was missing the + at the end)

The SQL database I’m working with has the number defined as numeric(28,12), so I suppose I need to validate anything in that range, although by business logic enforces a value of 0 to 9,999.99.

So, while any data I put in using my validation will work for the business rules defined, I have to account for data already in the database, as it’s fed by another system.

I need all those numbers to validate:

.5
0.5
450.000000000000  
.450
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1 Answer

  1. Editorial Team

    The regex as you have it now should work fine. Here is a walk through of each portion of the regex:

    [-+]?   # matches '-' or '+', optional
[0-9]*  # matches zero or more digits, as many as possible
\.?     # matches a '.', optional
[0-9]+  # matches one or more digits, as many as possible

    For “.5” the first two portions are missing, but that would not fail the match. Not sure why you are having troubles but it could be with the .NET code, post it and we can try to help.

    You may want to try escaping the “-” in your first character class ([\-+]), this shouldn’t be necessary since the “-” is the first character, but when “-” is in a character class it usually specifies a range.

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