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quick sed help

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# 1  
Old 02-20-2008
quick sed help
what's the code for delete everything before [ for every line in a file?
Thank you so much
yoyoyo [hello]
sssss [hello]
asdf [hello]
become:
[hello]
[hello]
[hello]
# 2  
Old 02-20-2008
Code:
sed "s/^.*\[/[/" input_file

# 3  
Old 02-21-2008
Code:
sed 's/\(.*\)\(\[.*\)/\2/'

# 4  
Old 02-21-2008
This will delete upto the first [ in the line.

Code:
sed -e "s/^[^\[]*\[/\[/g" file.txt

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