I am trying to come up with a valid pattern for an HTML5 form. I would like to allow all upper & lower case letters, spaces, numbers, and the symbols / \ @ # $ % & .
I've tried a couple different formats but I haven't had any luck.
So far I have:
Address: <input type="text" name="Address" size="25" pattern="[a-zA-Z0-9 ]{2,35}]" title="Title" required/>
Alexander Jardim
This is an example I built with w3schools test page:
<!DOCTYPE html>
<html>
<body>
<form onsubmit="getElementById('s').innerHTML=getElementById('i').value;return false;">
Country code: <input id="i" type="text" name="country_code" pattern="([a-zA-Z0-9]| |/|\\|@|#|\$|%|&)+" title="Three letter country code">
<input type="submit">
</form>
<p>Submitted value: <span id="s">Note: The pattern attribute of the input tag is not supported in Internet Explorer 9 and earlier versions, or in Safari.
You can use it to make your own tests at http://www.w3schools.com/tags/tryit.asp?filename=tryhtml5_input_pattern
来源：https://stackoverflow.com/questions/17353792/html5-form-pattern-validation