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change line found by pattern using sed

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# 1  
Old 10-14-2008
change line found by pattern using sed
I want to change a line like
Code:
CPM_THRESHOLD    0.8            //

to a new value using sed
I am trying
Code:
sed -i "s/CPM_THRESHOLD/CPM_THRESHOLD\t$COH\t\t\/\//" $INPUT_4

but how can i substitute the whole line begining with CPM_THRESHOLD and substitute it?
# 2  
Old 10-14-2008
Code:
cat input
CPM_THRESHOLD is this

sed 's/^CPM_THRESHOLD.*$/change/' input
change

# 3  
Old 10-14-2008
perfect, thanks
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