String validation using REGEX

Question

Have searched for my solution on google and finally decided to post a question here.

My requirement is to send only A C and R characters as input and the maximum length of the string passed should not be more than 6 characters.

Following are the valid states:

A,C,R,

A,R,C,

R,A,C,

R,C,A,

C,R,A,

C,A,R,

R,C,

C,R,

A,R,

R,C,

A,

......

and so on. All possible combinations of A, C, R, are possible but the maximum lenght should not increase 6 char.

So far I am able to perform pattern validation like ([ACR],)+ but also want to perform size validation in same regex.

So for now, I'm using condition like

if(!status.matches("([ACR],)+") || status.length()>6){
SOP
}

This implementation of size I have to use across multiple methods.

Thanking in advance.

This is very easily found with google. You need to improve your searching technique. — keyser
– keyser, Commented Apr 24, 2012 at 9:28
Are the commas considered as chars? Should the string ends with a comma? — sp00m
– sp00m, Commented Apr 24, 2012 at 9:28

Guillaume Polet · Accepted Answer · 2012-04-24 09:25:07Z

1

This should work:

([ACR],){1,3}

answered Apr 24, 2012 at 9:25

Guillaume Polet

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Comments

keyser · Accepted Answer · 2012-04-24 16:48:22Z

0

This regex will allow a pattern to be repeated between 1 and 3 times (in this case the pattern is a dot, i.e. any character):

.{1,3}

Replace the dot with any regex. In your case ([ACR],)

In other words: replace the + with {1,3}

edited Apr 24, 2012 at 16:48

answered Apr 24, 2012 at 9:26

keyser

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3 Comments

Guillaume Polet Over a year ago

Replacing the + with {1,6} will allow up to 12 chars, not 6 since the group contains 2 chars

Ameya Over a year ago

it would be 3 for my case , after executive hit and run , this is a combination I found , that solves my problem ^([ACR],){1,3}$

keyser Over a year ago

@GuillaumePolet Yes, it gives the number of times the pattern is allowed to be repeated. Edited answer.

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