Find the location of a character in string

by

You can use gregexpr

 gregexpr(pattern ='2',"the2quickbrownfoxeswere2tired")


[[1]]
[1]  4 24
attr(,"match.length")
[1] 1 1
attr(,"useBytes")
[1] TRUE

or perhaps str_locate_all from package stringr which is a wrapper for gregexpr stringi::stri_locate_all (as of stringr version 1.0)

library(stringr)
str_locate_all(pattern ='2', "the2quickbrownfoxeswere2tired")

[[1]]
     start end
[1,]     4   4
[2,]    24  24

note that you could simply use stringi

library(stringi)
stri_locate_all(pattern = '2', "the2quickbrownfoxeswere2tired", fixed = TRUE)

Another option in base R would be something like

lapply(strsplit(x, ''), function(x) which(x == '2'))

should work (given a character vector x)

More Related Contents:

  1. Replace single backslash in R
  2. Remove all special characters from a string in R?
  3. Create new column in dataframe based on partial string matching other column
  4. R/regex with stringi/ICU: why is a ‘+’ considered a non-[:punct:] character?
  5. Select rows from data.frame ending with a specific character string in R
  6. R split on delimiter (split) keep the delimiter (split)
  7. Is there an R function to escape a string for regex characters
  8. Remove square brackets from a string vector
  9. Overlapping matches in R
  10. Remove all characters before a period in a string
  11. How to measure similarity between strings?
  12. Extracting numbers from vectors of strings
  13. How to remove all whitespace from a string?
  14. Extract info inside all parenthesis in R
  15. Regex how to match an optional character
  16. Regex group capture in R with multiple capture-groups
  17. Remove all text between two brackets
  18. Regular expression – starting and ending with a character string
  19. Escaped Periods In R Regular Expressions
  20. R dplyr: rename variables using string functions
  21. Regular Expression Match to test for a valid year
  22. What is a regex to match ONLY an empty string?
  23. regex for preserving case pattern, capitalization
  24. Regex empty string or email
  25. Test for numeric elements in a character string
  26. Are there raw strings in R for regular expressions?
  27. extract number after specific string
  28. Replace string only once with php preg_replace
  29. Regex return file name, remove path and file extension
  30. Get Twitter @Username with Regex in R

Leave a Comment