word<-"xyz9874w9874w"
gsub( "([a-z]+)([0-9]+)([a-z])(\w)", "\1", word )
[1] "xyz874w"
gsub( "([a-z]+)([0-9]+)([a-z])(\w)", "\2", word )
[1] "9874874w"
gsub( "([a-z]+)([0-9]+)([a-z])(\w)", "\3", word )
[1] "w874w"
gsub( "([a-z]+)([0-9]+)([a-z])(\w)", "\4", word )
[1] "9874w"
word<-"xyz9874w9874w"
gsub( "([a-z]+)([0-9]+)([
阅读背景：
R中正则表达式的复杂组
来源：互联网
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