regex - RegularExpressionValidator asp.net -

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i trying make sure user can input a-z , 0-9 characters. have used regularexpressionvalidator class:

<asp:textbox id="input" text="search" runat="server" ontextchanged="searchfunc"></asp:textbox> <asp:regularexpressionvalidator id="regexp" runat="server"                                           errormessage="only a-z or 0-9 allowed"                                      controltovalidate="input"                                              validationexpression="^[a-z0-9]+$" />

though in code behind trying check if user entered valid input using

regexp.isvalid

but method returns true if user inputs !&%() can't understand i've done wrong. regular expression wrong?

call regexp.isvalid after validation has been performed otherwise default value set true.

try calling regexp.validate() before checking isvalid property.


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