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find and replace pattren in file

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# 1  
Old 08-09-2007
find and replace pattren in file
Hi,

I have the input file having data as follow:
file1.txt
001 aaa_1:abcd
002 bbb_2:abcd

I want output as,
001xabcd
002xabcd

Here iam trying to replace "{1 space}{alphanumeric string with underscore}{:}" with characrter "x".
I tried to achieve this using sed;but Iam not getting this correctly.

Thanks in advance. Smilie
# 2  
Old 08-09-2007
check this
Code:
sed 's/^\(.*\) \(.*:\)\(.*\)$/\1x\3/g' testfile

# 3  
Old 08-09-2007
Code:
sed 's/ .*:/x/' file1.txt

# 4  
Old 08-09-2007
perl -i.bak -pe 's/THIS/THAT/g' file ...
# 5  
Old 08-09-2007
It's working!!!

Thanks. Smilie
# 6  
Old 08-09-2007
Agreeing with your request, the {alphanumeric string with underscore} corresponds to "[0-9a-zA-Z_][0-9a-zA-Z_]*". So:

Code:
sed "s/ [0-9a-zA-Z_][0-9a-zA-Z_]*:/x/g" file1.txt

But I think this is better:

Code:
sed "s/ .*:/x/g" file1.txt

Bye Smilie
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