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grep -a "[^\x20-\x7e]+" test.csv
grep -a '[^\x20-\x7e]+' test.csv
grep "[^\x20-\x7e]+" test.csv
grep '[^\x20-\x7e]+' test.csv
also tried the flags -P and -E but all do not return me the result I want.
In Powershell, I did
Select-String -Pattern '[^\x20-\x7E]+' test.csv
and it returned me the expected result.
Could someone point me in the right direction for MINGW64 bash grep (GNU grep) 3.1 on Windows10? 
It is installed via git download for windows here: https://git-scm.com/download/win
                @WiktorStribiżew It doesn't for my environment. I get the entire file contents as my output.
– ycx
                Apr 26, 2020 at 11:18
                @WiktorStribiżew Its a standard Windows10 install and MINGW64 is installed via git download for Windows.
– ycx
                Apr 26, 2020 at 11:26
                Also, try grep -P "[^[:ascii:]]" if you need to print any line that has non-ASCII symbol.
– Wiktor Stribiżew
                Apr 26, 2020 at 12:44
It appears the POSIX BRE and ERE syntax in grep for Windows do not support \xXX notation.
You may use -P option to enable the PCRE regex engine and then use
grep -P "[^\x{00}-\x{7E}]" file
grep -P "[^[:ascii:]]" file
to find any line containing a non-ASCII character. 
NOTE that you cannot use [^\x20-\x7E] range because the CR (part of the line ending in Windows text files) will get matched, and all lines but the last (if it is not followed with trailing line break(s)) will get matched. You may add CR symbol though to the negated character class and use grep -P "[^\x{0D}\x{20}-\x{7E}]" file though.
                Thanks for the answer, this works. However, I do have a requirement to use grep for this. :(
– ycx
                Apr 26, 2020 at 11:40
                On Windows10, the default is grep (GNU grep) 3.1 via MINGW64 and I'm actually interested in finding out why this does not work in this particular case if it could be helped.
– ycx
                Apr 26, 2020 at 11:50
        
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