I want to use JavaScript (can be with jQuery) to do some client-side validation to check whether a string matches the regex:
^([a-z0-9]{5,})$
Ideally it would be an expression that returned true or false.
I'm a JavaScript newbie, does match()
do what I need? It seems to check whether part of a string matches a regex, not the whole thing.
This question is related to
javascript
regex
match
Use /youregexp/.test(yourString)
if you only want to know whether your string matches the regexp.
Here's an example that looks for certain HTML tags so it's clear that /someregex/.test()
returns a boolean:
if(/(span|h[0-6]|li|a)/i.test("h3")) alert('true');
try
/^[a-z\d]{5,}$/.test(str)
console.log( /^[a-z\d]{5,}$/.test("abc123") );_x000D_
_x000D_
console.log( /^[a-z\d]{5,}$/.test("ab12") );
_x000D_
You can use match()
as well:
if (str.match(/^([a-z0-9]{5,})$/)) {
alert("match!");
}
But test()
seems to be faster as you can read here.
Important difference between match()
and test()
:
match()
works only with strings, but test()
works also with integers.
12345.match(/^([a-z0-9]{5,})$/); // ERROR
/^([a-z0-9]{5,})$/.test(12345); // true
/^([a-z0-9]{5,})$/.test(null); // false
// Better watch out for undefined values
/^([a-z0-9]{5,})$/.test(undefined); // true
You can try this, it works for me.
<input type="text" onchange="CheckValidAmount(this.value)" name="amount" required>
<script type="text/javascript">
function CheckValidAmount(amount) {
var a = /^(?:\d{1,3}(?:,\d{3})*|\d+)(?:\.\d+)?$/;
if(amount.match(a)){
alert("matches");
}else{
alert("does not match");
}
}
</script>
please try this flower:
/^[a-z0-9\_\.\-]{2,20}\@[a-z0-9\_\-]{2,20}\.[a-z]{2,9}$/.test('[email protected]');
true
const regExpStr = "^([a-z0-9]{5,})$"
const result = new RegExp(regExpStr, 'g').test("Your string") // here I have used 'g' which means global search
console.log(result) // true if it matched, false if it doesn't
_x000D_
let str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
let regexp = /[a-d]/gi;
console.log(str.match(regexp));
I would recommend using the execute method which returns null if no match exists otherwise it returns a helpful object.
let case1 = /^([a-z0-9]{5,})$/.exec("abc1");
console.log(case1); //null
let case2 = /^([a-z0-9]{5,})$/.exec("pass3434");
console.log(case2); // ['pass3434', 'pass3434', index:0, input:'pass3434', groups: undefined]
Use test()
method :
var term = "sample1";
var re = new RegExp("^([a-z0-9]{5,})$");
if (re.test(term)) {
console.log("Valid");
} else {
console.log("Invalid");
}
Source: Stackoverflow.com