JavaScript regex for alphanumeric string with length of 3-5 chars

Question

I need regex for validating alphanumeric String with length of 3-5 chars. I tried following regex found from the web, but it didn't even catch alphanumerics correctly.

var myRegxp = /^([a-zA-Z0-9_-]+)$/;
if(myRegxp.test(value) == false)
{
    return false;
}

Consider learning to read regexes so you can figure out which satisfy your needs and which don't. Or better yet, so you can write your own. — BoltClock, Jan 20 '11 at 09:01
That is good idea, but i don't have time for this task to do that, but of course that's what i'll have to do. — newbie, Jan 20 '11 at 09:33

score 88 · Accepted Answer · answered Jan 20 '11 at 09:01

88

add {3,5} to your expression which means length between 3 to 5

/^([a-zA-Z0-9_-]){3,5}$/

answered Jan 20 '11 at 09:01

Sachin Shanbhag

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do you need the parenthesis? – EralpB Nov 23 '16 at 18:29
@EralpB yes we need parenthesis('()') to check the length of alphanumeric as a whole – Pitchiah Natarajan Nov 03 '17 at 13:19
Its not working in JS...am I missing something here ('s' is the string to be matched)? ```const pattern = '/^([a-zA-Z0-9]){3,40}$/'; const res = s.match(pattern) ``` – IROC Apr 13 '22 at 06:14

Daniel Gehriger · Answer 2 · 2011-01-31T10:13:37.687

6

You'd have to define alphanumerics exactly, but

/^(\w{3,5})$/

Should match any digit/character/_ combination of length 3-5.

If you also need the dash, ~~make sure to escape it (\-)~~ add it, like this: :

/^([\w\-]{3,5})$/

Also: the ^ anchor means that the sequence has to start at the beginning of the line (character string), and the $ that it ends at the end of the line (character string). So your value string mustn't contain anything else, or it won't match.

edited Jan 31 '11 at 10:13

answered Jan 20 '11 at 09:03

Daniel Gehriger

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You don't need to escape the dash if it's the first or last character inside a character class. – Tim Pietzcker Jan 20 '11 at 09:33
Didn't know that (and I have been using regex for decades ;-). Thanks. But it doesn't hurt either, right? – Daniel Gehriger Jan 20 '11 at 09:37

shareef · Answer 3 · 2017-07-02T13:38:55.040

First this script test the strings N having chars from 3 to 5.

For multi language (arabic, Ukrainian) you Must use this

var regex = /^([a-zA-Z0-9_-\u0600-\u065f\u066a-\u06EF\u06fa-\u06ff\ufb8a\u067e\u0686\u06af\u0750-\u077f\ufb50-\ufbc1\ufbd3-\ufd3f\ufd50-\ufd8f\ufd92-\ufdc7\ufe70-\ufefc\uFDF0-\uFDFD]+){3,5}$/;  regex.test('мшефн');

Other wise the below is for English Alphannumeric only

/^([a-zA-Z0-9_-]){3,5}$/

P.S the above dose not accept special characters

one final thing the above dose not take space as test it will fail if there is space if you want space then add after the 0-9\s

\s

And if you want to check lenght of all string add dot .

var regex = /^([a-zA-Z0-9\s@,!=%$#&_-\u0600-\u065f\u066a-\u06EF\u06fa-\u06ff\ufb8a\u067e\u0686\u06af\u0750-\u077f\ufb50-\ufbc1\ufbd3-\ufd3f\ufd50-\ufd8f\ufd92-\ufdc7\ufe70-\ufefc\uFDF0-\uFDFD]).{1,30}$/;

JavaScript regex for alphanumeric string with length of 3-5 chars

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