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I am currently trying to split a string on the pipe delimiter: 

999|150|222|(123|145)|456|12,260|(10|10000)

The catch is I don't want to split on | inside of parentheses, I only want to split on this character outside of parentheses.

This is just splitting on every | character, yielding the results I don't want:

x <- '999|150|222|(123|145)|456|12,260|(10|10000)'
m <- strsplit(x, '\\|')

[[1]]
[1] "999"    "150"    "222"    "(123"   "145)"   "456"    "12,260" "(10"   
[9] "10000)"

I am looking to get the following results keeping everything inside of parentheses:

[[1]]
[1] "999"        "150"        "222"        "(123|145)"  "456"       
[6] "12,260"     "(10|10000)"

Any help appreciated.


You can switch on PCRE by using perl=T and some dark magic:

x <- '999|150|222|(123|145)|456|12,260|(10|10000)'
strsplit(x, '\\([^)]*\\)(*SKIP)(*F)|\\|', perl=T)

# [[1]]
# [1] "999"        "150"        "222"        "(123|145)"  "456"       
# [6] "12,260"     "(10|10000)"

The idea is to skip content in parentheses. Live demo

On the left side of the alternation operator we match anything in parentheses making the subpattern fail and force the regular expression engine to not retry the substring using backtracking control. The right side of the alternation operator matches | (outside of parentheses, what we want...)

Skip commas in brackets regexp - MATLAB Answers, using strsplit, so that XO(12,13,14,15) is not split at the commas. I would therefore like to ignore the content inside the brackets. Any help would  To preserve all or part of the delimiter, enclose in parentheses the part that you want to preserve. If the <Max-substrings> parameter is added, this takes precedence when your command splits up the collection. If you opt to include a delimiter as part of the output, the command returns the delimiter as part of the output; however, splitting


One option:

scan(text=gsub("\\(|\\)", "'", x), what='', sep="|")
#[1] "999"      "150"      "222"      "123|145"  "456"      "12,260"   "10|10000"

Here's another way using strsplit. There are other answers here using strsplit, but this seems to be the simplest pattern that works:

strsplit(x, "\\|(?!\\d+\\))", perl=TRUE)
# [1] "999"        "150"        "222"        "(123|145)"  "456"        "12,260"     "(10|10000)"

Split string or character vector at specified delimiter, but then what if you needed to use a comma in your string and not split on it? An example of this could be a large number. So maybe we'd have a string like this: In R, you use the paste() function to concatenate and the strsplit() function to split. In this section, we show you how to use both functions. In this section, we show you how to use both functions. First, create a character vector called pangram , and assign it the value “The quick brown fox jumps over the lazy dog” , as follows:


This seems to work

x <- '999|150|222|(123|145)|456|12,260|(10|10000)'
m <- strsplit(x, '\\|(?=[^)]+(\\||$))', perl=T)

# [[1]]
# [1] "999"        "150"        "222"        "(123|145)"  "456"        "12,260"    
# [7] "(10|10000)"

Here we not just split on the | but we also use a look ahead to make sure that there are no ")" marks before the next | or the end of the string. Note that this method doesn't require or ensure the parenthesis are balanced and closed. We assume your input is well formatted.

Regex: Splitting by Character, Unless in Quotes, Assuming the text on the left cannot contain opening parenthesis, splitting by the first opening approach, you might also use re.sub() which would not require checking if there is a match or not. And r"", clean_title).lower() 'alone in the dark​'. Very often you may have to manipulate a column of text in a data frame with R. You may want to separate a column in to multiple columns in a data frame or you may want to split a column of text and keep only a part of it. tidyr’s separate function is the best […]


Extract left text outside the parenthesis if any, Python example to split string into tokens using the delimiters in the string. and does not allow for multiple delimiters or account for possible whitespace around re.split(r '[;,\s]\s*' , line) # split with delimiters comma, semicolon and space the regular expression pattern involve a capture group enclosed in parentheses. Split string with multiple delimiters. The split () method of string objects is really meant for very simple cases, and does not allow for multiple delimiters or account for possible whitespace around the delimiters. In cases when you need a bit more flexibility, use the re.split () method: example2.py. >>> import re.


Python string split() example, Split a string using a pattern: strsplit() , stringr::str_split() Apostrophes can be used in R to define strings (as well as quotation marks). use an apostrophe as an apostrophe and not a string delimiter, we need to use the “escape” character \' . Hi everybody. I&#39;m trying to split a string such that every array element would have characters between open and close prentesis. mmm let me just


Regular Expressions in R, escaped special characters. \t \n \r, tab, linefeed, carriage return. \u00A9, unicode escaped ©. Groups & Lookaround. (abc), capture group. \1, backreference to  number of pieces to return. Default (Inf) uses all possible split positions. For str_split_fixed, if n is greater than the number of pieces, the result will be padded with empty strings. For str_split_n, n is the desired index of each element of the split string. When there are fewer pieces than n, return NA. simplify