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I want to add disallow user to submit form if the user input contains 'xyz.co.in' in the input fields but this should be done with html5 pattern, I do not want to do it with jquery or javacript. Can anyone please help me with what should be its respective pattern, I mean what should go in pattern field in <input type='text' pattern='<some pattern goes here>'/>

So that user can insert anything in the input field except xyz.co.in.

UPDATE

Here is what I have so far:

<!doctype html>
<html>
    <head>
        <title>disallow a pattern</title>
    </head>
    <body>
        <form action="" >
            <input type="text" pattern="^(?!.*\bxyz\.co\.in\b)" />
            <input type="submit" name="Go1" value="Go"/>
        </form>
    </body>
</html>

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    So, you shared with us what you need. Now, please let us know where you got stuck. Commented Sep 7, 2015 at 9:51
  • @stribizhev I think I dint understand what you are asking for but still let me try to explain, Actually I know home to apply patters to define the acceptable strings I mean I know how to write a pattern to define that my input field should have at least 3 words or start with so and so string but I do not know how to restrict user if he enters so and so string anywhere in the string. Does it answers your question? Commented Sep 7, 2015 at 10:22
  • Good, please add the code you have written so far to your question. Commented Sep 7, 2015 at 10:26
  • Well I havent written anything Actually I do not know what to write neither I find any site explaining how to write patterns to disallow a string in pattern. Commented Sep 7, 2015 at 10:29

1 Answer 1

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Disallowing some string to be inside a larger string can be done with a negative look-ahead anchored at the beginning.

Here is an example that disallows xyz.co.in in an input string:

^(?!.*xyz\.co\.in).*

See demo

If you want to allow mmmxyz.co.inmmmm in the input string, add word boundaries \b around the word.

Note that pattern attribute value is anchored by default, so ^ might not be necessary, and .* is necessary to ensure the entire string is matched.

UPDATE

To disallow input of xyz.co.in and allow any other, use

^(?!xyz\.co\.in$).*
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5 Comments

it does not allow me to enter anything have a look at jsbin.com/zuwiqijafu/edit?html,output
Ah yes, it expects the whole string match. Add .* at the end.
But I want something like user can enter anything except xyz.co.in
P.S. could you please remove the -1 from my question
I can only give you +1, as that minus is not mine. Does my solution work for you?

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