Match alphanumeric string with length six chars using regex

Question

I need regex for validating alphanumeric String with length of 6 chars. I tried with following regex And done it for allowing alphanumeric chars but don't know how to stop exceeding more than six chars.

var regex = new RegExp("^[a-zA-Z0-9\b]+$");

Fiddle here.

@AlexK. _dont know __how to stop exceeding more than six chars.___ — Pranav C Balan, May 12 '16 at 16:51
Above solutions are not working .It allows more than six characters in the input field. — htoniv, May 12 '16 at 16:52
What's the reason fot that `\b`? Inside a character group it's nothing but an escaped b, which is already included in `a-z` — Sebastian Proske, May 12 '16 at 16:52
@htoniv: Please provide a fiddle with non-working code. How are you using the regex? I guess `/^[A-Za-z0-9]{1,6}$/` should work. — Wiktor Stribiżew, May 12 '16 at 16:54
@WiktorStribiżew fiddle link here https://jsfiddle.net/htoniv/gjxz1ze3/1/ — htoniv, May 12 '16 at 16:56
As I thought. You only check one character against the whole regex. — Wiktor Stribiżew, May 12 '16 at 17:00
Read any basic regexp tutorial or documentation. Or google for "javascript regexp limit n chars". Also, why are you not simply using a regexp literal? — , May 12 '16 at 18:10
I attached my fiddle link. can u make this workable. https://jsfiddle.net/htoniv/gjxz1ze3/2/. @torazaburo — htoniv, May 13 '16 at 05:45
I raised a similar question (no uppercase support), https://stackoverflow.com/q/76370865/10655742, the question was answered by using the boundery flag `\b` so you need `\b[a-zA-Z0-9]{6}\b` — KargWare, Jun 01 '23 at 06:21

score 2 · Answer 1 · answered May 12 '16 at 16:50

2

you just have to add {6} in the end

var regex = new RegExp('[a-zA-Z0-9\b]{6}$'); You can test it out here https://regex101.com/

answered May 12 '16 at 16:50

Wild Widow

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Match alphanumeric string with length six chars using regex

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