How to find the Indices of All Occurrences of Substring in R - Step by Step Examples

How to find the Indices of All Occurrences of Substring in R ?

Answer

To find the indices of all occurrences of a substring in R, you can use the regexpr and gregexpr functions to find all occurrences and store their indices.


✐ Examples

1 Find Indices of All Occurrences in String

In this example,

  1. We create a string variable str with a string value.
  2. We use the gregexpr function with a regular expression pattern to find all occurrences of the pattern within str and store their indices.
  3. We print the indices of all occurrences.

R Program

str <- 'Hello Hello Hello'
indices <- gregexpr('Hello', str)[[1]]
print(paste('Indices of all occurrences:', indices))

Output

Indices of all occurrences: 1 7 13

2 Find Indices of All Occurrences in Another String

In this example,

  1. We create two string variables str1 and str2 with different values.
  2. We use the gregexpr function with a regular expression pattern to find all occurrences of the pattern within str1 and store their indices.
  3. We print the indices of all occurrences.

R Program

str1 <- 'apple banana cherry banana'
str2 <- 'banana'
indices <- gregexpr(str2, str1)[[1]]
print(paste('Indices of all occurrences:', indices))

Output

Indices of all occurrences: 7 21

Summary

In this tutorial, we learned How to find the Indices of All Occurrences of Substring in R language with well detailed examples.


More R Strings Tutorials

  1. How to Create an Empty String in R ?
  2. How to get Length of String in R ?
  3. How to get Character at Specific Index in String in R ?
  4. How to get First Character in String in R ?
  5. How to get Last Character in String in R ?
  6. How to get First N Characters in String in R ?
  7. How to get Last N Characters in String in R ?
  8. How to get Substring after Specific Character in R ?
  9. How to get Substring before Specific Character in R ?
  10. How to get Substring between two Specific Characters in R ?
  11. How to get Substring from Specific Index to End in R ?
  12. How to Iterate over Characters in String in R ?
  13. How to Iterate over Words in String in R ?
  14. How to Check if String is Empty in R ?
  15. How to Check if String contains only Alphabets in R ?
  16. How to Check if String contains only Alphabets and Numbers in R ?
  17. How to Check if String contains only Numeric Digits in R ?
  18. How to Check if a String contains given Substring in R ?
  19. How to Check if String contains specific Character in R ?
  20. How to Check if String starts with Specific Prefix in R ?
  21. How to Check if String ends with Specific Suffix in R ?
  22. How to Append a String to another String in R ?
  23. How to Append a Character to beginning of a String in R ?
  24. How to Append a Character to end of a String in R ?
  25. How to Concatenate Two Strings in R ?
  26. How to Repeat a String N Times in R ?
  27. How to Insert Character at Specific Index in String in R ?
  28. How to Replace a Substring in String in R ?
  29. How to Replace multiple Spaces with a Single Space in String in R ?
  30. How to Replace Character at Specific Index in String in R ?
  31. How to Replace All Occurrences of a Substring in a String in R ?
  32. How to Replace a Substring in a String using Regular Expression in R ?
  33. How to Split a String in R ?
  34. How to Split a String by New Line in R ?
  35. How to Split a String by Comma in R ?
  36. How to Sort Characters in String in R ?
  37. How to convert String to Lowercase in R ?
  38. How to convert String to Uppercase in R ?
  39. How to Trim a String in R ?
  40. How to convert First Character in String to Uppercase in R ?
  41. How to Reverse a String in R ?
  42. How to Remove Character at specific Index in a String in R ?
  43. How to Remove First Character in a String in R ?
  44. How to Remove Last Character in a String in R ?
  45. How to Remove first N Characters in a String in R ?
  46. How to Remove last N Characters in a String in R ?
  47. How to Remove specific Substring in R ?
  48. How to Remove specific Character from a String in R ?
  49. How to Remove All Whitespace Characters from a String in R ?
  50. How to Remove Special Characters from a String in R ?
  51. How to keep only Alphabets in a String in R ?
  52. How to Convert Integer to String in R ?
  53. How to Convert String to Integer in R ?
  54. How to convert String to Float in R ?
  55. How to convert Float to String in R ?
  56. How to check if Two Strings are Equal in R ?
  57. How to check if Two Strings are Equal ignoring case in R ?
  58. How to Compare Two Strings in R ?
  59. How to find the Characters in the First String that are not Present in the Second String in R ?
  60. How to find the Index of Substring in R ?
  61. How to find the Index of Last Occurrence of Substring in R ?
  62. How to find the Indices of All Occurrences of Substring in R ?
  63. How to get all the possible Substrings of a String in R ?
  64. How to get all the possible K length Substrings in a String in R ?