Partial text search to update repeating group

Surely I am missing something so how can a search box take a partial text string and use this to filter a repeating group. Lets say I have following in unfiltered repeating group
BM1001
BM1002
BM2001
BM2002
EC1001
EG1001
CP2405
CP2410

if I type BM in search box I want RG to display 4 records BMxxxx
If I type BM1 in search box I want RG to display 2 records BM1xxx
If I type EG in search box, again 2 records EGxxx

Can anybody help?

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