regex - break a text file into several blocks with perl -

i have file contains diff output, looks this:

26c26 < or in bright light of morning  --- > or in bright light of evning  34c34,36 < clouds roll clear of summits.  --- > hello world > came here ask > questions  43,44c45 < how imagine orchid boat?  < gets harder. days come , go,  --- > don't cry tonigh,  49,50c50,52 < though caught imprisoning moment.  < golden leaf in autumn spins dark river  --- > che che che che changes.  > la la la la la  > song 

i wnat process file block block, twho blocks sepreated delimeter of form:

{number}c{number} example 48c70

or

{number},{number}c{number} example 90,120c70

or

{number},{number}c{number},{number} example 36,40c88,1020

or

{number}c{number},{number} example 99,100c70

for example, file above containes 4 blocks:

block 1:

26c26 < or in bright light of morning  --- > or in bright light of evning  

block 2:

34c34,36 < clouds roll clear of summits.  --- > hello world > came here ask > questions  

block 3:

43,44c45 < how imagine orchid boat?  < gets harder. days come , go,  --- > don't cry tonigh,  

block 4:

49,50c50,52 < though caught imprisoning moment.  < golden leaf in autumn spins dark river  --- > che che che che changes.  > la la la la la  > song 

how can using perl?

thank you

split string based on

(?=^(\d+,)?\d+c\d+(,\d+)?$) 

here online demo