Regex pattern for a number inside square bracket

user_19209823 0
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I am trying to replace strings which start with a number inside a square bracket with a word.

[1]FirstWord!FF  >> FirstReplace!!FF
[2]SecondWord!FF  >> SecondReplace!!FF

This code only works if there is no [number] at the beginning.

'test!FF' %>% str_replace_all("test(['\"])?!","replace!")

But how can I update the pattern if I have something like below:

'[1]test!FF' %>% str_replace_all("[1]test(['\"])?!","replace!")
r regex
1 Answers

You want

'[1]test!FF' %>% str_replace_all("\\[\\d+]test['\"]?!", "replace!")
## => [1] "replace!FF"

Note: If the [number] part is optional, wrap it with an optional non-capturing group: "(?:\\[\\d+])?test['\"]?!".

Details:

  • \[ - a [ char
  • \d+ - one or more digits
  • ] - a ] char
  • test - a test word
  • ['\"]? - an optional " or '
  • ! - a ! char.
user_38329700
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