replace

问题 I want to replace a character at N position in a string. This my query: SELECT code FROM tablecodes The result is 3 rows: AXGETYTRTFYZUFYZFFFDIZEG GFYZUFYZFAXFCDIZAX ZUFYZGEFYFAXFFIXZRA I can't figure out how to replace the last 'Z' character on each row with 'A'. I want the result to look like this: AXGETYTRTFYZUFYZFFFDIAEG GFYZUFYZFAXFCDIAAX ZUFYZGEFYFAXFFIXARA The 'Z' character is always in the same position (length of the string - 3) Any suggestions? Thanks. 回答1: Use Stuff Function

问题 I want to replace a character at N position in a string. This my query: SELECT code FROM tablecodes The result is 3 rows: AXGETYTRTFYZUFYZFFFDIZEG GFYZUFYZFAXFCDIZAX ZUFYZGEFYFAXFFIXZRA I can't figure out how to replace the last 'Z' character on each row with 'A'. I want the result to look like this: AXGETYTRTFYZUFYZFFFDIAEG GFYZUFYZFAXFCDIAAX ZUFYZGEFYFAXFFIXARA The 'Z' character is always in the same position (length of the string - 3) Any suggestions? Thanks. 回答1: Use Stuff Function

问题 I want to remove all \r \n \r\n which is pretty easy to so I wrote: str_replace(array("\r","\n"),"",$text); but I saw this line: str_replace(array("\r","\n","\\r","\\n"),"",$text); and I was wondering what is the double backslash means \\r and \\n . 回答1: \ is an escape character, it's used to escape the following character. In "\n" , the backslash escapes n and the result will be a new line character. In "\\n" , the first backslash escapes the second backslash and the n is kept as is, so the

问题 I would like to change the upper case string characters in a variable to lower case and replace the spaces with "_". I know I can use an 'if' statement for all instances but this would take too long. It is to save the input of a user to a filename i.e. user_selection = 'Barracuda Limited' # what I have save_name == 'barracuda_limited' # what I want Note: I have read through the page on how to post and am trying my best, but I have just started to learn coding and am having trouble trying to

问题 I would like to change the upper case string characters in a variable to lower case and replace the spaces with "_". I know I can use an 'if' statement for all instances but this would take too long. It is to save the input of a user to a filename i.e. user_selection = 'Barracuda Limited' # what I have save_name == 'barracuda_limited' # what I want Note: I have read through the page on how to post and am trying my best, but I have just started to learn coding and am having trouble trying to

问题 For example I need something that will parse a string and go through and replace multiple street types abbreviations with their full word ('Rd' would become 'Road'). This is sort of answered here but I would like something with a single object like below because this is going to be a pretty long list and this would help keep the correct organization, var streets = { 'RD': 'ROAD', 'ST': 'STREET', 'PL': 'PLACE'}; I know I've seen things like this before, but I'm kind of lost as to how to

问题 I'm trying to remove sensitive data like passwords from my Git history. Instead of deleting whole files I just want to substitute the passwords with removedSensitiveInfo . This is what I came up with after browsing through numerous StackOverflow topics and other sites. git filter-branch --tree-filter "find . -type f -exec sed -Ei '' -e 's/(aSecretPassword1|aSecretPassword2|aSecretPassword3)/removedSensitiveInfo/g' {} \;" When I run this command it seems to be rewriting the history (it shows

问题 I’m trying to convert each integer in a string to its corresponding value in an object based on its key–value entries. For example if I have: var arr = { "3": "value_three", "6": "value_six", "234": "other_value" }; var str = "I want value 3 here and value 234 here"; I would expext the output to be: new_str = "I want value_three here and value other_value here" 回答1: I'm just doing this off the top of my head, but this should work. var new_str = str; for (var key in arr) { if (!arr

问题 I have a large Word file that refers to multiple Question #s throughout. I also have an Excel file that lists all the Question #s in Column A and in Column B there is a list of actual questions that are also hyperlinks. I would like to replace every question # in the Word document with the corresponding hyperlinked question in Column B of the spreadsheet. I tried to use the macro in the StackOverflow question Multiple find and replace in MS Word from a list in MS Excel, but I get the Run-time

问题 Suppose I have this dataset: set.seed (1234); data.frame(cbind(a=rep(c("si","no"),30),b=rnorm(60)), c=rep(c("d","e","f"),20)) %>% head() Then I want to add many columns (in this example I only added two), to identify distinct cases between each group (in this case, column "a"). set.seed(1234); data.frame(cbind(a=rep(c("si","no"),30),b=rnorm(60)),c=rep(c("d","e","f"),20)) %>% group_by(a) %>% dplyr::mutate_at(vars(c(b,c)), .funs= list(dups_hash_ing= ~n_distinct(.))) This code leaves the