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sed command to print lines after expression

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Operating Systems Solaris sed command to print lines after expression
# 1  
Old 05-12-2010
sed command to print lines after expression
Hi guys.
I need a sed command to print like 10 lines after a regular expression is found in the log.

Can anyone help me out.

Thanks

---------- Post updated at 10:52 AM ---------- Previous update was at 10:34 AM ----------

never mind.
I just did the search bewteen two expressions.
# 2  
Old 05-12-2010
just in case you would need it later:

Code:
grep -n "$reg_exp" file.txt |while read LINE ;do i=$(echo $LINE |cut -d':' -f1 ) ;sed -n "$i,$(($i+10))p" file.txt ;done

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