Pastable version of check pattern and add zeroes

<pre class='prettyprint' language='javascript'>function checkInterval(event) {
	if ( true == new RegExp( /^\d$/ ).match( event.element().value ) ) {
		event.element().value = '00:0' + event.element().value;
	}
	if ( true == new RegExp( /^\d\d$/ ).match( event.element().value ) ) {
		event.element().value = '00:' + event.element().value;
	}
	if ( true == new RegExp( /^:\d\d$/ ).match( event.element().value ) ) {
		event.element().value = '00' + event.element().value;
	}
	if ( true == new RegExp( /^\d:\d\d$/ ).match( event.element().value ) ) {
		event.element().value = '0' + event.element().value;
	}
	if ( false == new RegExp( /^\d\d:\d\d$/ ).match( event.element().value )) {
		alert( event.element().value + ' ÑÐ²Ð»ÑÐµÑ‚ÑÑ Ð½ÐµÐ¿Ñ€Ð°Ð²Ð¸Ð»ÑŒÐ½Ñ‹Ð¼ Ð·Ð½Ð°Ñ‡ÐµÐ½Ð¸ÐµÐ¼' );
		event.element().value = event.element().value.substr(0,5);
	}
	if ( -1 == event.element().value.indexOf( ':' ) ) {
		event.element().value = '';
	}
}</pre>
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Pastable version of check pattern and add zeroes