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Exact match with regular expression

 
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# 1  
Old 09-05-2008
Exact match with regular expression
Hi
I have a file with data arranged into columns. The first column is the chromosome name.
When I use grep to subset only rows with chr1, I get chr1 but also chr10, chr11,..
How do I get only rows with chr1?

grep chr1 filein > fileout
head fileout
chr1 59757841
chr11 108258691
chr10 86158268
chr12 112891635

thanks
Joseph
# 2  
Old 09-05-2008
[ Please start a new thread for the new issue, thanks (moved)!]

Code:
grep '^chr1[^0-9]' filename

Last edited by radoulov; 09-05-2008 at 07:34 PM..
# 3  
Old 09-06-2008
Or grep -w chr1 filename
 
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