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help with grep regexp


 
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# 1  
Old 02-12-2011
Data help with grep regexp

My input file looks like this:
Code:
13154|X,the deer hunter
13154|Y,the good life
1316|,american idol
1316|,bowling
1316|,chuck
etc...

The X, Y, or any other character (besides a comma) after the pipe is a "Device Type". I want to strip out lines that do not have a device type.

I have tried:
Code:
grep  "\|.," input.txt

but it matches everything. I think I need to escape the pipe, and that the dot should require a single character match before the comma, but what else am I missing?

I have also tried:
Code:
grep "\|[A-Z]+," input.txt

and
Code:
grep "\|[A-Z]{1}," input.txt

but that matches everything too. I have also tried escaping the comma, but that does not help. This is GNU grep 2.5.1 on Mac OS X Snow Leopard. Any suggestions would be greatly appreciated.

Last edited by Scott; 02-12-2011 at 11:29 AM.. Reason: Please use code tags
# 2  
Old 02-12-2011
You mean anything with a | followed by a , should be removed?
Code:
$ grep -v "|," input.txt
13154|X,the deer hunter
13154|Y,the good life

# 3  
Old 02-12-2011
Quote:
Originally Posted by scottn
Code:
$ grep -v "|," input.txt

Thanks scott. In java regexps, the | means OR and has to be escaped, so I had assumed it has to be escaped in grep regexps too. It seems that's not the case. I had tried something similar with grep -v as well, but I was escaping the pipe. This works great. Thanks again.

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