How to get all occurance of a string in clob data in MySQL -

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i have 1 clob field 'class_data' in table 'school' , in clob there 1 tag name '<fee-value>' , want select occurrences of tag clob data. used below query in mysql , select first occurrence of tag(there 12 occurrence of vallue)

select substr(class_data, instr(class_data,'fee-value'),30)  school class='s013' , grade='a' , date ='20130301';

the value showing :

<fee-value>200</fee-value>

and there 11 more such kind of tags not shown please suggest how do?


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