regex - Regular expression for asp.net -


i need in regular expression. validating textbox text when updating records. when click update button, first 5 letters should equal cm000 or cm000. how validate using regular expression in asp.net. know validationexpression this. let me know .

thanks

you don't need regex - instead:

bool isvalid      = textbox.text.startswith("cm000", stringcomparison.ordinalignorecase);

if must use regex (like validation control) use this:

<asp:regularexpressionvalidator      runat="server"      id="someid"      controltovalidate="textbox"     validationexpression="^(?:cm|cm)000"     errormessage="invalid input" />

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