TextBox validation using regex

[mathewgk80]

Hi,

I am trying to check whether the textbox contains single quote,double quote and < and > symbols.

I got the regex to check all the requirements.
its as shown below.

str=(document.g etElementById(' txtEnter')).val ue;

str.match(/([\<\])(1,))* ([\>])/)==null (for checking < and > symbol)

str.match(["'"])==null (for checking single quote)

and

str.match(['"'])==null) (for checking double quotes.)

Now i give all these conditions as

if(str.match(/([\<\])(1,))* ([\>])/)==null && str.match(["'"])==null && (str.match(['"'])==null))

alert("error");

else
alert("no error");

It works fine.

In the above code i used str.match() three times. I need to use str.match() only one time and need to check whether the textbox contains < or > or single quote or double qoute.

Please help me..

Thanks in Advance.

Mathew.

[gits]

here is a short example ... you may just use the | for the OR :)

[CODE=javascript]var s = 'fo\'o';

alert(/[<]|[>]|[']|["]/g.test(s)); [/CODE]
kind regards

PS: and please use the code-tags when posting source code.

[rnd me]

if you are trying to remove html, you'd better be a lot more thoughtful than the regexps i see posted unless you also validate on the server.

there's more than one way to say <script, onclick="alert( 'bad')", etc...

check out the xss cheatsheet for more info.