In this article I will explain with an example, how to check whether string contains
special characters using
JavaScript.
HTML Markup
The HTML Markup consists of following elements:
TextBox – For capturing user input.
Button – For validating string.
The Button has been assigned with a
JavaScript onclick event handler.
Name:<input type="text" id="txtName" />
<br />
<br />
<input type="button" value="Submit" onclick="Validate()" />
Checking Special Characters in string using Regular Expression in JavaScript
When the Button is clicked, the
Validate JavaScript function is called.
Inside this function, first the
Regular Expression is defined and the value of the TextBox is tested against it.
If string i.e. TextBox value any character other than Alphabets, Numbers or Space then it will be considered as
invalid and an appropriate message will be displayed in
JavaScript Alert Message Box.
<script type="text/javascript">
function Validate() {
//Regex for Valid Charactersi.e. Alphabets, Numbers and Space.
var regex = /^[A-Za-z0-9 ]+$/
//Validate TextBox value against the Regex.
var isValid = regex.test(document.getElementById("txtName").value);
if (!isValid) {
alert("Contains Special Characters.");
}else {
alert("Does not contain Special Characters.");
}
return isValid;
}
</script>
Screenshot
![Check whether String contains Special Characters using JavaScript]()
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Demo
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