Split string in to many & control the occurence

Hi Experts,

I have requirement in my mapping to split the input string in to 30 characters each & the occurrence of target field should be controlled by number of strings obtained after splitting. Each split string obtained after splitting to be populated to the corresponding occurrence of target field. Say for example I have input string with 110 characters in the input field so 4 times target field should occur in the target XML with 30,30,30,20 characters in the each occurence of target field.

Thanks,

Ramu.