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Regex doesn't work as expected in javascript

I created a regex to test the name where only "_", "-", ",". "Are allowed.

Here's a regular expression:

^[a-zA-Z][a-zA-Z0-9\.\-_']{1,24}$

The problem is that this resolving name has @

, Check Demo screenshot :

var str = "deepak@";
var str2 = "@@";
alert(str.match("^[a-zA-Z][a-zA-Z0-9\.\-_]{1,24}$"));//allowing why?
alert(str2.match("^[a-zA-Z][a-zA-Z0-9\.\-_]{1,24}$"));//not allowing

Expected: The name having @

should not admit.

Note. When I checked this regex at https://regex101.com/#javascript it works well

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2 answers


Don't forget to use regex separator in Javascript:

alert(str.match(/^[a-zA-Z][a-zA-Z0-9\.\-_]{1,24}$/));

Or even better:



alert(str.match(/^[a-zA-Z][\w'.-]{1,24}$/));

Updated JSFiddle

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I think it would do the same:

str.match(/^\w{1,24}$/);


Definition:

The \ w metacharacter is used to search for a word character. Word character is a character from az, AZ, 0-9, including the _ (underscore) character.

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