How to create a regular expression for cricket overs

Please tell me what regular expression should i use to validate cricket overs in textbox. like it can be 5.1, 5.2,5.3,5.4,5.5 but it should not contain fraction value greater than .5 ,also the values should be nu开发者_运维知识库meric only (float and int)

Thanks

Try this:

<script type="text/javascript">
var testString = '5.4';
var regExp = /^\d+(\.[1-5])?$/;
if(regExp.test(testString))
{
 // Do Something
}
</script>

You should use this:

^[0-9]+(\.(50*|[0-4][0-9]*))?$

If you also want fractions like .2 instead of 0.2, use this:

^[0-9]*(\.(50*|[0-4][0-9]*))?$

Explained:

^                beginning of the string
[0-9]*           repeat 0 or more digits
(
  \.             match the fraction point
  (
     50*         match .5, or .5000000 (any number of zeros)
     |           or 
     [0-4][0-9]* anything smaller  than .5
  )
)?               anything in this parenthesis is optional, for integer numbers
$                end of the string

Your version, [0-9]+(\.[0-5])? does not work unfortunately, because, for example /[0-9]+(\.[0-5])?/.test("0.8") yields true.