vim: how to use back reference to compare strings?

hi guys:

I run into a scenario that , I need to compare 2 part of the regex string in one line :

"abc123456 bla bla bla abc1234"

so I'm thinking, can we use the backreference, to compare the first abc\d\+ with the second one and only print out a message in case we detect the different ones ? preferably if this can be done with one command...

thanks!

 

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