I want to highlight two identical string if present in word document to be highlighed

For example in my word table there are somuch data with some patent numbers
I would like to find the duplicate patent numbers and want to highlight

Specific example

I have string like this

1. WO 12345 A1
2. US 12345 A2
3. EP 12345 A1
4. WO 12345 A1
5. WO 12345 A3
6. US 12345 A2

Note that above strings are distributed in tables with other data

I want to highlight strings which have [A-Z]{2} [0-9]{4,} duplicate.