i want to validate the text box.this is text box contain item number availability check .if the user enters only special character like( !@#$%^&+)(**)_)":}{?> )throw the alert message. item number : m_test-120 What I have tried: i use Regex r = new Regex(@"[~`!@#$%^&*()+=|\\{}':;.,<>/?[\]""_-]"); if (r.IsMatch(tbxspirno.Text.ToString().Trim())) { Master.ShowMessage("Enter valid item number", MessageHelper.MessageType.Information); }

try this for special character validation function isSpclChar () { var iChars = "!@#$%^&*()+=-[]\\\';,./{}|\": ?" ; if ( document . qfrm . q . value . indexOf ( iChars ) != - 1 ) { alert ( "The box has special characters. \nThese are not allowed.\n" ); return false ; } }

string str2 = "____!&&**^%$##@"

ValidationExpression = "[\%\/\\\&\?\,\'\;\:\!\-]+"

What I think is instead of trying to identifying what you don't want (which could be too much to filter out) identify what you want. Then reject if input is not as per what you want. Just a thought. So build a regular expression according to your item number pattern and show message when NOT r.IsMatch() Hope it helps!

Answers

How to validate if text box have only special character?

Raja

369

i want to validate the text box.this is text box contain item number availability check .if the user enters only special character like( !@#$%^&+)(**)_)":}{?> )throw the alert message.<br /><div> </div><div>item number :    m_test-120</div> <strong>What I have tried:</strong><br /> <br /> i use <br /> <br /> Regex r = new Regex(@"[~`!@#$%^&*()+=|\\{}':;.,<>/?[\]""_-]");<br /> if (r.IsMatch(tbxspirno.Text.ToString().Trim()))<br /> {<br /> Master.ShowMessage("Enter valid item number", MessageHelper.MessageType.Information);<br /> }