Extract part of string between two different patterns

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I try to use stringr package to extract part of a string, which is between two particular patterns.

For example, I have:

my.string <- "nanaqwertybaba"
left.border  <- "nana"
right.border <- "baba"

and by the use of str_extract(string, pattern) function (where pattern is defined by a POSIX regular expression) I would like to receive:

"qwerty"

Solutions from Google did not work.


I do not know whether and how this is possible with functions provided by stringr but you can also use base regexpr and substring:

pattern <- paste0("(?<=", left.border, ")[a-z]+(?=", right.border, ")")
# "(?<=nana)[a-z]+(?=baba)"

rx <- regexpr(pattern, text=my.string, perl=TRUE)
# [1] 5
# attr(,"match.length")
# [1] 6

substring(my.string, rx, rx+attr(rx, "match.length")-1)
# [1] "qwerty"

Extract part of string between two different patterns, I do not know whether and how this is possible with functions provided by stringr but you can also use base regexpr and substring : pattern  To extract part string between two different characters, you can do as this: Select a cell which you will place the result, type this formula =MID(LEFT(A1,FIND(">",A1)-1),FIND("<",A1)+1,LEN(A1)), and press Enterkey. Note: A1 is the text cell, >and <are the two characters you want to extract string between.


In base R you can use gsub. The parentheses in the pattern create numbered capturing groups. Here we select the second group in the replacement, i.e. the group between the borders. The . matches any character. The * means that there is zero or more of the preceeding element

gsub(pattern = "(.*nana)(.*)(baba.*)",
     replacement = "\\2",
     x = "xxxnanaRisnicebabayyy")
# "Risnice"

How to get the substring between two markers in Python, Use indexing. Extracting the substring between two known marker strings returns the characters between the two markers as a new string. For example, if string  Split string of 'number + text' pattern If you are splitting cells where text appears after number, you can extract numbers with the following formula: =LEFT (A2, SUM (LEN (A2) - LEN (SUBSTITUTE (A2, {"0","1","2","3","4","5","6","7","8","9"}, ""))))


I would use str_match from stringr: "str_match extracts capture groups formed by () from the first match. It returns a character matrix with one column for the complete match and one column for each group." ref

str_match(my.string, paste(left.border, '(.+)', right.border, sep=''))[,2]

The code above creates a regular expression with paste concatenating the capture group (.+) that captures 1 or more characters, with left and right borders (no spaces between strings).

A single match is assumed. So, [,2] selects the second column from the matrix returned by str_match.

Extract substrings between start and end points, This MATLAB function extracts the substring from str that occurs between the substrings If str is a string array or a cell array of character vectors, then extractBetween When you specify different start and end positions with numeric arrays, they Select the text between two substrings, and also the substrings themselves. Vectorised over string and pattern. str_extract (string, pattern) str_extract_all (string, pattern, simplify = FALSE)


You can use the package unglue:

library(unglue)
my.string <- "nanaqwertybaba"
unglue_vec(my.string, "nana{res}baba")
#> [1] "qwerty"

To extract values between two strings of text - Build, how to extract data between two different strings of text file if text file is stored in extract that particular portion… please help me to pocess21.2(list items).xaml  The formula extracts the string between words 'provide' and 'and'. The Excel FIND function allows the formula to be case sensitive. If there are any leading and trailing spaces, the formula will also extract them. To remove the leading and trailing apply the Excel TRIM function to the entire formula.


Extract string between two strings - Build, Hello guys I am struggling with how to extract a dynamic string between two particular string! Example: ID. No: 01 NAME: Singh, Aryan  Assuming that you have a list of data in range B1:B5, in which contain text string values. And you need to extract all text strings between two words “excel” and “learning” in cells. You can use a formula based on the MID function, the SEARCH function, and the Len function to extract text between two specified strings.


Get Substring from String in Java, The practical ways of using the useful substring functionality in Java - from The only difference is that it returns a CharSequence instead of a String we're going to see how to extract a substring nested between two Strings:. I am trying to find a simple way to extract an unknown substring (could be anything) that appear between two known substrings. For example, I have a string: a<-" anything goes here, STR1 GET_ME STR2, anything goes here" I need to extract the string GET_ME which is between STR1 and STR2 (without the white spaces).


Extract String Between Two STRINGS, reuJ8yVCgSM: Downloading video info webpage [youtube] reuJ8yVCgSM: Extracting video information [youtube] reuJ8yVCgSM: Downloading MPD manifest  The s/// is the substitution operator and the regular expression looks for the 1st (.+?, the ? makes it match the shortest possible string) = and then captures the longest stretch of non-, characters after that. The s/// replaces what was matched with what was captured (what was inside the parentheses).