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Regular Expressions



/*
JavaScript Bible, Fourth Edition
by Danny Goodman 

John Wiley & Sons CopyRight 2001
*/


<HTML>
<HEAD>
<TITLE>Got a Match?</TITLE>
<SCRIPT LANGUAGE="JavaScript1.2">
function commafy(form) {
    var re = /(-?d+)(d{3})/
    var num = form.entry.value
    while (re.test(num)) {
        num = num.replace(re, "$1,$2")
    }
    form.commaOutput.value = num
}
function decommafy(form) {
    var re = /,/g
    form.plainOutput.value = form.commaOutput.value.replace(re,"")
}
</SCRIPT>
</HEAD>
<BODY>
<B>Use a regular expression to add/delete commas from numbers:</B>
<HR>
<FORM>
Enter a large number without any commas:<BR>
<INPUT TYPE="text" NAME="entry" SIZE=15><P>
<INPUT TYPE="button" VALUE="Insert commas" onClick="commafy(this.form)"><P>
The comma version is:<BR>
<INPUT TYPE="text" NAME="commaOutput" SIZE=20><P>
<INPUT TYPE="button" VALUE="Remove commas" onClick="decommafy(this.form)"><P>
The un-comma version is:<BR>
<INPUT TYPE="text" NAME="plainOutput" SIZE=15><P>
<INPUT TYPE="reset">
</FORM>
</BODY>
</HTML>