regextract: Extract (sub)strings matching regex pattern

In SimPhe: Tools to Simulate Phenotype(s) with Epistatic Interaction

Description

Extract (sub)strings matching regex pattern.

Usage

regextract(x, pattern, ...)

Arguments

x	a character vector.
pattern	regular expression to be found in x.
...	not used.

Details

Extract the substrings of x that match the regex pattern pattern. The pattern may contain groups (enclosed in parentheses) which will result in further substrings extracted.

Derived from the help on regmatches, take a look at the help there

Value

a character (string) matrix where the first column contains the global match for the pattern, each pair of '()' will result in another column with the respective match.

Author(s)

Benno Pütz [e-mail]

Examples

s <- "Test: A1 BC23 DEF456"
pattern = "([[:alpha:]]+)([[:digit:]]+)"
regextract(s, pattern)

# equivalent to this example from the help page for grep()
lapply(regmatches(s, gregexpr(pattern, s)), function(e) regmatches(e, regexec(pattern, e)))

Example output

     [,1] [,2] [,3] [,4]   [,5] [,6] [,7]     [,8]  [,9] 
[1,] "A1" "A"  "1"  "BC23" "BC" "23" "DEF456" "DEF" "456"
[[1]]
[[1]][[1]]
[1] "A1" "A"  "1" 

[[1]][[2]]
[1] "BC23" "BC"   "23"  

[[1]][[3]]
[1] "DEF456" "DEF"    "456"   

SimPhe documentation built on May 1, 2019, 9:10 p.m.