tutoring2

Code log

Jiaxiang Li 2018-12-18

strings <- c("a", "ab", "acb", "accb", "acccb", "accccb")
grep("ac+b", strings, value = TRUE)
#> [1] "acb"    "accb"   "acccb"  "accccb"
grep("ac.+b", strings, value = TRUE)
#> [1] "accb"   "acccb"  "accccb"
grep("ac.b", strings, value = TRUE)
#> [1] "accb"

^{Created on 2018-12-18 by the reprex package (v0.2.1)}

这里的

1. + = rebus::one_or_more()
2. . = rebus::ANY_CHAR

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