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Date reformatting

 
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# 1  
Old 08-21-2011
Date reformatting
I have a file with temperature measurements:

Code:
Loc1,20090102,71.55
Loc1,20090103,71.65
Loc1,20090104,71.55
Loc1,20090105,71.54
Loc1,20090106,71.54

However, to load this into a database I would like to reformat the dates (column 2) from the yyyymmdd format to the yyyy-mm-dd format. I have come up with the following:
Code:
sed -i '' -e 's/,([0-9]{4})([0-9]{2})([0-9]{2}),/,\1-\2-\3,/' date.txt

But that leads to:
Code:
sed: 1: "s/,([0-9]{4})([0-9]{2}) ...": \1 not defined in the RE

Can someone tell me how to correct this regex?

UPDATE: Also tried the following, which is also syntactically correct:
Code:
sed -i '' -e 's/,\([0-9]{4}\)\([0-9]{2}\)\([0-9]{2}\),/,\1-\2-\3,/' date.txt

but that left the file unchanged.
Last edited by figaro; 08-21-2011 at 07:50 AM.. Reason: Updated with new code
# 2  
Old 08-21-2011
This regex is correct... in Perl Smilie
Code:
perl -i -pe 's/,([0-9]{4})([0-9]{2})([0-9]{2}),/,\1-\2-\3,/' date.txt

This User Gave Thanks to bartus11 For This Post:
figaro
# 3  
Old 08-22-2011
Quote:
Originally Posted by figaro
UPDATE: Also tried the following, which is also syntactically correct:
Code:
sed -i '' -e 's/,\([0-9]{4}\)\([0-9]{2}\)\([0-9]{2}\),/,\1-\2-\3,/' date.txt

but that left the file unchanged.
You would need to escape the curly braces as well..
Code:
sed 's/,\([0-9]\{4\}\)\([0-9]\{2\}\)\([0-9]\{2\}\),/,\1-\2-\3,/' inputfile

This User Gave Thanks to michaelrozar17 For This Post:
figaro
 
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