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Asked: 2026-06-08T08:02:23+00:00

Trying to set up a simple .jsp to test JavaScript regular expressions and avoid

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Trying to set up a simple .jsp to test JavaScript regular expressions and avoid having to clean/build/republish my testing server every time I make a change. The existing code was taken from a project on which I was working to add recognition of Spanish characters, but this code as it is doesn’t seem to catch any mismatches at all.

<html>
<head>
    <script language="JavaScript">
        function isValidTarget(target) {
            if (regexTarget.target.search(/^[a-zA-Z\#\@\!\&\.\*\-:;<>"',\?0-9 ]+$/) == -1) {
                alert("Your input contains one or more invalid characters.");
            }
        }
    </script>
</head>
<body>
    <form name="regexTarget" method="post" onSubmit="return isValidTarget(this)">
        Target: <input type="text" name="target"/>
        <input type="submit" value="Submit" />
    </form>
</body>
</html>
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1 Answer

  1. Editorial Team

    You’re trying to search the DOM node instead of its value. Try this:

    regexTarget.target.value.search(...)
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