Hi,
If anyone stuck like me then below is solution for this :
=> ^[a-z_A-Z0-9]+=\d+(,[a-z_A-Z0-9]+=\d+)*$
[a-z_A-Z0-9]+ => this indicate match for string. here + mean multiple character .
= => as ":" was not shown in engine-config suggesion I used '=' as seperator.
\d+ => any number. + indicate double/triple... digit number.
(,[a-z_A-Z0-9]+=\d+) => This indicate repetition unit and * indicate this unit can present multiple time or zero time.
$ => indicate end of line.
I am not good at regex but hope this might help someone.
Thanks,
Rohit