Regular expression helps you in pattern matching in string. : Matches any single charcter except a new line : Matches the preceding character or repeated character. The basic expression for matching entered value as number in the field is: /^[0-9] $/.
This data is passed to ASP script, or some other technology and if the data contains an error, there will be a delay before the information travels over the Internet to the server, is examined on the server, and then returns to the user along with an error message. Checking for form completion: The first step of form validation is to check, whether the user have entered information in all the fields or not.If the string value is numeric, it will return true, otherwise it will return false.As a PRO member, you can drag-and-drop upload files here to use as resources.
You can even edit them anytime, like any other code on Code Pen.If the element complies than sufunction returns an empty string.