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.

Answer 1

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}