JavaScript: First Word that Starts with "qu"

Using JavaScript, how can I get the first word in a string that starts with "qu"?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Demo</title>

<script type="text/javascript">

var str='The duck quacked quietly';

alert( first_qu(str) );  // Should be "quacked"

function first_qu(str) {
 return str;
}

</script>
</head>
<body>

</body>
</html>

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LVL 16
hankknightAsked:
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leakim971PluritechnicianCommented:
http://jsfiddle.net/mNQet/1/
//'The duck quacked quietly')
    var str='The duck quacked quietly';

alert( first_qu(str) );  // Should be "quacked"

function first_qu(str) {
 return /qu[^(qu) ]*/.exec(str);
}

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Ronak PatelCommented:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Demo</title>

<script type="text/javascript">

var str='The duck quacked quietly';

alert( first_qu(str) );  // Should be "quacked"

function first_qu(str) 
{
	var arr = str.split(" ");
	var startWithQU = new Array();
	var index = 0;
	for (i = 0; i < arr.length; i++)
	{
		if(arr[i].substr(0,2) == "qu")
		{
			startWithQU[index] = arr[i];
			index++;
		}
	}
	
	return startWithQU[0];
}

</script>
</head>
<body>

</body>
</html>

Open in new window

hankknightAuthor Commented:
Oops, I may have accepted an answer too soon.  There is a problem:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Demo</title>

<script type="text/javascript">

var str='quackquack hello world';
alert( first_qu(str) );  // Should be "quackquack"

var str='Hello quackquachk 123';
alert( first_qu(str) );  // Should be "quackquachk"

function first_qu(str) {
 return /qu[^(qu) ]*/.exec(str);
}

</script>
</head>
<body>

</body>
</html>

Open in new window

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hankknightAuthor Commented:
This works:


function first_qu(str) {
 return /qu[^W) ]*/.exec(str);
}

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leakim971PluritechnicianCommented:
Remove (qu) in the regex,  I'm not at my desk ...
leakim971PluritechnicianCommented:
http://jsfiddle.net/mNQet/2/

function first_qu(str) {
 return /qu[^ ]*/.exec(str);
}

Open in new window

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