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To replace string between two strings

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# 1  
Old 10-07-2008
To replace string between two strings
how do i replace a string within two strings ?. i have a string called my_string i.e
Code:
my_string="GACAHX04GAC010000000001DDELTA   0001DAT00001320SLTZ"

i need to replace all characters between DAT and SLTZ with zeros, the number of characters between these strings might vary .
i.e
output
Code:
GACAHX04GAC010000000001DDELTA   0001DAT00000000SLTZ

Any hints will be much appreciated .
# 2  
Old 10-07-2008
Code:
new_string=`echo $my_string | awk '{printf("%s%08d%s",substr($0,1,39),"0",substr($0,48))}'`

Regards
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