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up vote 2 down vote favorite

I only want alphanumeric, numbers, space, dash and underscore. I am using

[\w\s-_]*

But because I have allowed spaces, a space is allowed as input, in html5 how can i validate if only spaces are entered as input.

Also is there any regular expression checking integers for 1+.

Edit:

allowing integers from 1 to any positive integers {1, 2, 3, ...}

share|improve this question
    
Please, elaborate on your last statement. 1+?? –  Ravi Thapliyal May 20 '13 at 10:29
    
must your pattern match 1-2? –  Casimir et Hippolyte May 20 '13 at 10:42

3 Answers 3

up vote 2 down vote accepted

Use the following pattern that accepts a space only when surrounded by some other valid input characters as well. Please, note that \w already includes an _ underscore.

[\w-]+(\s[\w-]+)*

To match all positive integers >= 1 use the regex

^(?!0)\d+

The above excludes 0.

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thnx this is what i was looking for –  Naveen May 20 '13 at 10:39
    
Please consider accepting the answer unless you have any follow up question. –  Ravi Thapliyal May 20 '13 at 10:41
up vote 0 down vote 
this [link][1] will help you 
 OR try this 
   var str = document.getElementById("myInput").value;
   if (str.match(/^\s*$/)) {
    // nothing, or nothing but whitespace
   } else {
    // something
   }
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up vote 0 down vote

Here you need to write a little javascript to find out if there are only spaces. Get the input text then trim it and find if it's empty..

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