sed non ascii value remove


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# 1  
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.




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


sed is not working.


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


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


Last edited by Scrutinizer; 01-29-2020 at 12:46 AM..
# 2  
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  
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:
Code:
sed 's/[^\x00-\x7F]//g'  test.txt

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


--
Note:
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  
@Scrutinizer @RudiC thanks for quick respone.



i tried below one and getting the below error.



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


sed: -e expression #1, char 17: Invalid collation character
# 5  
What is your OS and version.
Can you show the exact command?
# 6  
FYI..Red Hat Enterprise Linux 7
VERSION_ID="7.7"
# 7  
And what is the command?
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