'How to validate a Number field in Javascript using Regular Expressions?

Is the following correct?

var z1=^[0-9]*\d$;
{
    if(!z1.test(enrol))
    {
        alert('Please provide a valid Enrollment Number');
        return false;
    }
}

Its not currently working on my system.

javascript

Solution 1:^[1]

var numberRegex = /^\s*[+-]?(\d+|\d*\.\d+|\d+\.\d*)([Ee][+-]?\d+)?\s*$/
var isNumber = function(s) {
    return numberRegex.test(s);
};

"0"           => true
"3."          => true
".1"          => true
" 0.1 "       => true
" -90e3   "   => true
"2e10"        => true
" 6e-1"       => true
"53.5e93"     => true

"abc"         => false
"1 a"         => false
" 1e"         => false
"e3"          => false
" 99e2.5 "    => false
" --6 "       => false
"-+3"         => false
"95a54e53"    => false

Solution 2:^[2]

Try:

var z1 = /^[0-9]*$/;
if (!z1.test(enrol)) { }

Remember, * is "0 or more", so it will allow for a blank value, too. If you want to require a number, change the * to + which means "1 or more"

Solution 3:^[3]

You this one and it allows one dot and number can have "positive" and "negative" symbols

/^[+-]?(?=.)(?:\d+,)*\d*(?:\.\d+)?$/.test(value)

Solution 4:^[4]

If you looking for something simple to test if a string is numeric, just valid numbers no +, - or dots.

This works:

/^\d*$/.test("2412341")

true

/^\d*$/.test("2412341")

false

Solution 5:^[5]

you can also use this regular expression for number validation
/^\/(\d+)$/

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1
Solution 2
Solution 3
Solution 4	Jean
Solution 5	Ashwani Kumar Kushwaha

'How to validate a Number field in Javascript using Regular Expressions?

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Solution 4:[4]

Solution 5:[5]