RegExp.input or RegExp.$_ is text which we are comparing regular expression with
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It is set automatically in some circumstances (e.g. when event handle for Form text field called as in example below)
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<SCRIPT LANGUAGE="JavaScript1.2">
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function getInfo() {
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re = /(\w+)\s(\d+)/;
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re.exec();
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window.alert(RegExp.$1 + ", your age is " + RegExp.$2); }
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</SCRIPT>
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Enter your first name and your age, and then press Enter.
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<FORM>
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<INPUT TYPE:"TEXT" NAME="NameAge" onChange="getInfo(this);">
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</FORM>
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