sed non ascii value remove

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# 1  
Old 01-28-2020
sed non ascii value remove

Hi All,

i am using the below perl command to remove the non ascii value,it is working fine.
we need to find the similar solution using the sed command. but i tried it is not working and getting the error.

perl -pe 's/[[:^ascii:]]//g'  test.txt

sed is not working.

sed -i 's/[^[:ascii:]]//g' test.txt

sed: -e expression #1, char 17: Invalid character class name

Last edited by Scrutinizer; 01-29-2020 at 12:46 AM..
# 2  
Old 01-28-2020
ascii is not found in the wctype character classes, nor mentioned in e.g. man regex.

What characters do you want to remove? Strange locales'? Be aware that control chars 0x00 - 0x1F (including e.g. <TAB> ) are in the ascii set as well...

Last edited by RudiC; 01-28-2020 at 10:01 PM..
# 3  
Old 01-29-2020
Classes like [:ascii:] and [:word:] are non-POSIX additional classes that can be found in perl, but are not recognised by standard sed.

Instead of [:ascii:], with GNU sed you could try a regex character range:
sed 's/[^\x00-\x7F]//g'  test.txt

To remove non-printable and non-"standard ascii" characters as RudiC suggests, you can try:
sed 's/[^\x20-\x7E]//g'  test.txt

I presume [[:^ascii:]] is a typo and you meant to write [^[:ascii:]]

Last edited by Scrutinizer; 01-29-2020 at 01:54 AM..
This User Gave Thanks to Scrutinizer For This Post:
# 4  
Old 01-29-2020
@Scrutinizer @RudiC thanks for quick respone.

i tried below one and getting the below error.

sed 's/[^\x00-\x7F]//g'

sed: -e expression #1, char 17: Invalid collation character
# 5  
Old 01-29-2020
What is your OS and version.
Can you show the exact command?
# 6  
Old 01-29-2020
FYI..Red Hat Enterprise Linux 7
# 7  
Old 01-29-2020
And what is the command?
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