[R] regular expressions

From: GOUACHE David <D.GOUACHE_at_arvalisinstitutduvegetal.fr>
Date: Wed, 12 Mar 2008 17:14:53 +0100


Hello all,  

Still fighting with regular expressions and such, I am again stuck:  

Suppose I have a vector of character chains. In this vector, I wish to identify which character chains start with a given pattern, and then replace everything that comes after said pattern.  

Here is a quick example :  

words<-c("plifboum","plafboum","ploufbang","plifplaf")  

I want to end up with something like this:  

"plifONE","plafboum","ploufbang","plifONE"
 

All I can produce so far is this :
gsub("\\bplif.","ONE",words,perl=T)  

which turns out :
"ONEboum","plafboum","ploufbang","ONEplaf"
 

Thanks in advance for your help.  

David Gouache

Arvalis - Institut du Végétal

Station de La Minière

78280 Guyancourt

Tel: 01.30.12.96.22 / Port: 06.86.08.94.32    



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