Trim the leading and trailing spaces : Filter « Regular Expressions « JavaScript Tutorial

<html>
<head>
<title>Trim Example</title>
<script type="text/javascript">
    String.prototype.trim = function () {
        var reExtraSpace = /^\s+(.*?)\s+$/;
        return this.replace(reExtraSpace, "$1");
    };


    function showText() {
        var oInput1 = document.getElementById("txt1");
        var oInput2 = document.getElementById("txt2");
        oInput2.value = oInput1.value.trim();
    }
</script>
</head>
<body>
<textarea rows="10" cols="50" id="txt1"></textarea><br />
<input type="button" value="Trim" onclick="showText()" /></p>
<P>Trimmed Text:<br />
<textarea rows="10" cols="50" id="txt2"></textarea></p>

</body>
</html>

26.5.Filter
	26.5.1.	Trim the leading and trailing spaces
	26.5.2.	Strip HTML
	26.5.3.	Bad word filter
	26.5.4.	Use regular expression to remove bad words