Regexp query is not working in elastaicsearch5.6

Hi I am working on elasticsearch 5.6.3, when I search with a query like
?q = Sample schema 3. Then this will return all records having any of these words sample,schema. Then I tried to search with ?q= *Sample*schema*3* , this one actually worked in elasticsearch 6.3.0 and returned record which have the value Sample schema 3. But when I used the same in elasticsearch 5.6.3 its returning nothing. Please help me to use the regexp correctly. Thanks in advance

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