Javascript RegExp Curly Brace and test Issue

Question

I want regExp to test for two 'Hello'-s and return true but it only returns false even though I cannot find anything wrong with my code. How do I fix this? Please also suggest what is wrong with the code.

<html>
<body>

<script type="text/javascript">

var str ="Hello Hello";
var patt = /(hello){2}/gi;
var result =patt.test(str);
document.write("Returned value: " + result); 
</script>
</body>
</html>

Answer 1

You can use the match() method which searches for a match between a regular expression and a string, and returns the matches.

   var result = "Hello hello".match(/Hello/gi); // Array { 0="Hello", 1="hello"}

   result.length // 2

If you want to use search instead of match:

   "hello hello ".search(/(hello ?){2}/gi); // it returns 0 when it find two occurrences of hello
                                            // if not it returns -1

Answer 2

You forgot the space:

var patt = /(hello ?){2}/gi;

Your original RE matches "HelloHello", but not two occurences of "Hello".

Javascript RegExp Curly Brace and test Issue

Question

2 answers

solution1
0 2012-04-07 07:06:00

solution2
0 ACCPTED 2012-04-07 07:15:53

Javascript RegExp Curly Brace and test Issue

Question

2 answers

solution1 0 2012-04-07 07:06:00

solution2 0 ACCPTED 2012-04-07 07:15:53

solution1
0 2012-04-07 07:06:00

solution2
0 ACCPTED 2012-04-07 07:15:53