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, ...}
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.
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..
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
}
1-2?