SEQanswers - View Single Post - How to add characters to start of fasta header

ajk · 01-13-2015, 08:01 AM

You're almost all the way there: just move the $1 to the end of the replacement string. Also, it'll be a little easier if you take the greater than (>) out of the match.

Code:

perl -p -e 's/^>(.*)/>New_Header_Info $1/' input.fasta > output.fasta

For this, you really don't need the /g at the end since you're matching the whole line and, because the .* is greedy, the $ at the end of the match string is unnecessary as well.

01-13-2015, 08:01 AM	#2
ajk Junior Member Location: Massachusetts Join Date: Feb 2009 Posts: 1	You're almost all the way there: just move the $1 to the end of the replacement string. Also, it'll be a little easier if you take the greater than (>) out of the match. Code: perl -p -e 's/^>(.)/>New_Header_Info $1/' input.fasta > output.fasta For this, you really don't need the /g at the end since you're matching the whole line and, because the . is greedy, the $ at the end of the match string is unnecessary as well.