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Hi, not exactly. [0-9a-f]\{4,\}- means a sequence of 4 or more hexadecimale digits ( a-f being lowercase ) followed by a dash.
\(...\)\{4\} means the sequence in escaped parentheses( "\(" and "\)"...

just change it to *.txt
cat *.txt ...

you are on the right track, maybe no need for awk.

uniq -c does a count.

you can simply sort -u

define gibberish.

you can use tr -cd to complement the search (if that's any easier):
eg:...