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[qwertyuiop924]

First off, readelf shouldn't switch between hex and base10. Secondly, that's DSV, so you shouldn't have written a regex for it. You should have either cut, or awk, both tools SPECIFICALLY DESIGNED to do what you want.

[Rapidwire → qwertyuiop924]

What's DSV?

[qwertyuiop924 → Rapidwire]

DSV: Delimiter Separated values. readelf uses a delimiter matching the regex /\w+/. In AWK, this is $FS by default, so AWK will parse this by default. Or you can pipe

  tr -s [:blank:] 

To cut, which will give you the row you want.