Trying to change date separator with sed

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# 1  
Old 08-03-2009
Trying to change date separator with sed

Hi there

I am trying to convert some date seperators in a large newline delimited file. each line i am interested in has a date in the format 27/05/2009 all I want is to convert the slashes to tildes(~) I have come up with the following code but it does nothing.

sed 's/\([0-9]\{2\}\)\/\([0-9]\{2\}\)\/\([0-9]\{4\}\) / \1~\2~\3 /' alltrans.test > at3.txt
sed 's_%([0-9]%{2%}%)%/%([0-9]%{2%}%)%/%([0-9]%{4%}%) _%1~%2~%3_' alltrans.test > at3.txt

# 2  
Old 08-03-2009

sed 's:\/:~:g'

# 3  
Old 08-03-2009
Hey Locks, that will change all occurences of / and unfortunately I need to only change them in the lines that have a date as the complete record. If it might make it any easier the date line is consitently every 19th line
# 4  
Old 08-03-2009
This works fine with my sample input (same as your first sed)

sed 's/\([0-9]\{2\}\)\/\([0-9]\{2\}\)\/\([0-9]\{4\}\)/\1~\2~\3/g' file

Check for space in your sed or give some sample input file
# 5  
Old 08-03-2009
Post the input and the expected output.
# 6  
Old 08-03-2009
Thanks John it was the spaces! The things you miss at 3am. What is the "g" on the end of the string for?
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