Find BTC Wallet Using Regular Expressions

Many years ago I received a small amount on BTC. Unfortunately, I changed the file name and type and now I can't locate it.
I ran into this.
Basically what I'm trying to do is to open all files as text files and then search in each one.
I tried something like this in cmd in Windows:

dir * /s/b | findstr ^(bc1|[13])[a-zA-HJ-NP-Z0-9]{25,39}$

But got an error message. Any ideas?

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