.net - Regular Expression validation in ASP.NET for special chars -


i need validate scenario in regex, i'm using regularexpression validation in asp.net.

  1. shouldn't start or end space
  2. doesn't contain space
  3. whole string shouldn't contain 2 special char "@" & "?"

valid:

"as#d qwe2", "&^%$$(&+_", "12#$.p"

invalid:

"  ", "asd ", " asd#", "ksdhf?kh", "asdf@asd"

i'm trying this:

<asp:regularexpressionvalidator id="regularexpressionvalidator1" runat="server" controltovalidate="textbox1"         errormessage="regularexpressionvalidator"          validationexpression="^[^\s]+(\s+[^@?]+)*[^\s]$">error</asp:regularexpressionvalidator>

untested regex: ^([^ @?][^@?]*[^ @?]|[^ @?])$


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