Find and replace pattern in VI editor

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# 1  
Old 09-07-2009
Find and replace pattern in VI editor

I have a text file which has the following data
X_SQL_13,X_SQL_14,X_SQL_15,X_SQL_16,X_SQL_17,X_SQL_18,X_SQL_19,X_SQL_20,X_SQL_21,X_SQL_22,X_SQL_23,X _SQL_24,X_SQL_25,X_SQL_26,X_SQL_27,
X_MSG_PARAM_3,X_MSG_PARAM_4,X_MSG_PARAM_5,C_TYPE_SQL) values ('ECP','TVP404100','select * from (select
,R SEQ,decode ( r,1 ,MESSAGE_LINE_1,

Can any one please tell me how to relace MESSAGE_LINE_1 to MESSAGE_LINE_16 with MESSAGE_LINE_1_1 to MESSAGE_LINE_16_1

I was using :%s/MESSAGE_LINE_16/MESSAGE_LINE_16_1/ in the VI editor
But I want something as as


# 2  
Old 09-07-2009
please delete this
# 3  
Old 09-07-2009

# 4  
Old 09-07-2009
With sed...
sed 's/\(MESSAGE_LINE_[0-9].*\)\(,.*\)/\1_1\2/g' infile

# 5  
Old 09-07-2009

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