python - How to grep for unicode characters? -


how search file using grep string of unicode characters?

i'm trying count number of occurrences of string "\xfe\n\xfe". can find python doing:

open(filename).read().count('\xfe\n\xfe')

this finds few thousand matches.

however, since loads entire file memory, crash if try search file larger system's memory.

so i'm trying equivalent grep via:

grep -p -c "\xfe\n\xfe" filename

it consumes 0 memory, great, though run on same file, finds 0 matches. what's wrong syntax?

you don't need read entire file memory. can iterate on file , count occurrence of string across lines taking pair of lines @ every instant:

count = 0 open(filename) f:    prev_line = next(f)    line in f:       if prev_line.endswith('\xfe\n') , line.startswith('\xfe'):          count += 1       prev_line = line

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