Hi,
Use this code,
<SCRIPT LANGUAGE="JavaScript"><!--
function demoMatchClick() {
var re = new RegExp(document.demoMatch.regex.value);
if (document.demoMatch.subject.value.match(re)) {
alert("Successful match");
} else {
alert("No match");
}
}

function demoShowMatchClick() {
var re = new RegExp(document.demoMatch.regex.value);
var m = re.exec(document.demoMatch.subject.value);
if (m == null) {
alert("No match");
} else {
var s = "Match at position " + m.index + ":\n";
for (i = 0; i < m.length; i++) {
s = s + m[i] + "\n";
}
alert(s);
}
}

function demoReplaceClick() {
var re = new RegExp(document.demoMatch.regex.value, "g");
document.demoMatch.result.value =
document.demoMatch.subject.value.replace(re,
document.demoMatch.replacement.value);
}
// -->
</SCRIPT>

<FORM ID="demoMatch" NAME="demoMatch" METHOD=POST ACTION="javascript:void(0)">
<P>Regexp: <INPUT TYPE=TEXT NAME="regex" VALUE="\bt[a-z]+\b" SIZE=50></P>
<P>Subject string: <INPUT TYPE=TEXT NAME="subject"
VALUE="This is a test of the JavaScript RegExp object" SIZE=50></P>
<P><INPUT TYPE=SUBMIT VALUE="Test Match" ONCLICK="demoMatchClick()">
<INPUT TYPE=SUBMIT VALUE="Show Match" ONCLICK="demoShowMatchClick()"></P>

<P>Replacement text: <INPUT TYPE=TEXT NAME="replacement" VALUE="replaced" SIZE=50></P>
<P>Result: <INPUT TYPE=TEXT NAME="result"
VALUE="click the button to see the result" SIZE=50></P>
<P><INPUT TYPE=SUBMIT VALUE="Replace" ONCLICK="demoReplaceClick()"></P>
</FORM>
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