Hi, Sorry, I am bad with regular expression and a beginner with R. How do I get only the numbers 0009987 from the following entry? GO:0009987~cellular process Thanks a lot, Stella -- View this message in context: http://r.789695.n4.nabble.com/Get-part-of-a-GO-term-tp4546125p4546125.html Sent from the R help mailing list archive at Nabble.com.