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To check if a variable (including a string) is a number, check if it is not a number: This works regardless of whether the variable contains is a string or number.
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In this article we will cover some basic types of validations in JavaScript. This article will cover the validations using the regex as well as using simple methods.
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While developing a web page in fully HTML controls, you may not be able to use ASP.NET's controls, then you may need the help of some JavaScript function for validation.;
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Click here for comprehensive JavaScript tutorials, and over 400+ free scripts!
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I think Niklas has the right answer to your problem. Besides that, I think the following date validation function is a little bit easier to read:
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