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Problem with sed command

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# 1  
Old 08-16-2010
Problem with sed command
Hi,

I have a file with data
demo_abc
demo abc
demo-abc
abc

Now i need to extract only abc from all the lines and print. i used the pattern /[a-z]*$/ . Can any one help me how to extract text "abc" only.
# 2  
Old 08-16-2010
Do you want to extract last three characters from all the lines?
# 3  
Old 08-16-2010
Hi,

Exactly not three characters because it can one/two or more. so i want the last characters.
# 4  
Old 08-16-2010
Can you provide better example?
# 5  
Old 08-16-2010
The following will delete all characters up to the last space, underscore, or dash, inclusive:
Code:
sed 's/.*[ _-]//'

Regards,
Alister
# 6  
Old 08-16-2010
Code:
 sed 's/.*[-_ ]//' infile
abc
abc
abc
abc

Code:
 
sed 's/[^abc]*//' infile
abc
abc
abc
abc

Code:
 sed 's/^....[^abc]//' infile
abc
abc
abc
abc

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