javascript - Regular expression returning some awkward value -


i have following javascript code:

<script type="text/javascript"> //javascript starts   var patt=/[<](\s+).*>(.*)<\/\1>/;  var str='<a id="test">hi</a> <p></p>';   alert(str.match(patt));  alert(patt.exec(str));  </script>

it expected to find tags in html document. ideally should return <a id="test">hi</a>, <p></p>.

but returns <a id="test">hi</a>, ,hi.

why happening?

also question, what difference between str.match(patt) , patt.exec(str) , better use?

var patt=/[<](\s+).*>(.*)<\/\1>/g;

try specify global modifier (or stop @ first occurrence found).

about second question mdn resource:
https://developer.mozilla.org/en/javascript/reference/global_objects/string/match

if regular expression not include g flag, returns same result regexp.exec(string). if regular expression includes g flag, method returns array containing matches. if there no matches, method returns null.


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