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Can someone please tell me how does client side regular expressions validation differ from the regex checking done on the server?
Any references to asp.net validation control shall be appreciated.
In asp.net, RegularExpressionValidator control can perform both client-side and server-side validation.
Otherwise, JavaScript RegExp object will be used to perform client side validation, while .NET Regular Expression Object Model will do the work server side.
In general, if client scripting is disabled, client-side validation will not run.
In this case, server-side validation is required. Unobtrusive JavaScript should grant a graceful degradation of the functionalities depending on the client scripting capabilities.