Regex is not working as expected in javascript

Question

I have created a regular expression for Name validation where only “_”, “-“, “‘“, “. “ allowed.

Here is regular expression:

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

Problem is this its allowing name having @, Check Fiddle demo:

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: Name having @ should not allow.

Note: When i tested this regex in https://regex101.com/#javascript its working good

anubhava · Accepted Answer · 2014-12-15 09:35:18Z

4

Don't forget to use regex delimiter 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

answered Dec 15, 2014 at 9:35

anubhava

790k67 gold badges603 silver badges671 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Vince V. · Accepted Answer · 2014-12-15 09:38:56Z

-1

I guess this would do the same:

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

Definition:

The \w metacharacter is used to find a word character. A word character is a character from a-z, A-Z, 0-9, including the _ (underscore) character.

answered Dec 15, 2014 at 9:38

Vince V.

3,1413 gold badges33 silver badges48 bronze badges

1 Comment

nhahtdh Over a year ago

You allow digits at the beginning of the string.

Collectives™ on Stack Overflow

Regex is not working as expected in javascript

2 Answers 2

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related