match

问题 I have mydf1 <- data.frame(ID = c(1,2,3,4,5), color = c("red", NA, NA, NA, "green"), name = c("tom", "dick", "harry", "steve", "mike")) mydf2 <- data.frame(ID = c(1,2,99), color = c("red", "orange", "yellow"), name = c("tom", "dick", "Aaron")) I would like to update mydf1$color with the corresponding color from mydf2 for any rows that match on both ID and name. The desired output would be to update the color in row 2 to orange and leave the rest as is: ID color name 1 1 red tom 2 2 orange

问题 How to do aggregation ( $group ) by the same values ​​from the array? Not all at once, but few or all, if any. I can do $group by one word, but I also need all possible variations... Collection example: {"keywords": ["gta", "distribution", "keys"]} {"keywords": ["gta", "online", "moto", "races"]} {"keywords": ["gta", "online", "samp"]} Result example: "gta" - 3 matches "online" - 2 matches "gta online" - 2 matches 回答1: You could use $reduce to extract all combinations of pairs from an array.

问题 How to do aggregation ( $group ) by the same values ​​from the array? Not all at once, but few or all, if any. I can do $group by one word, but I also need all possible variations... Collection example: {"keywords": ["gta", "distribution", "keys"]} {"keywords": ["gta", "online", "moto", "races"]} {"keywords": ["gta", "online", "samp"]} Result example: "gta" - 3 matches "online" - 2 matches "gta online" - 2 matches 回答1: You could use $reduce to extract all combinations of pairs from an array.

问题 I have a pattern as below: measurement = re.compile("(\d+(?:\.\d*)?)\s*x\s*(\d+(?:\.\d*)?)\s*(cm|mm|millimeter|centimeter|millimeters|centimeters)") It can be seen in several times in a sentence and in a document. I want to find all matches and replace it with "MEASUREMENT", also I want to add its value in a list. **Input_Text**: measuring 9 x 5 mm and previously measuring 8 x 6 mm **Output**: measuring MEASUREMENT and previously measuring MEASUREMENT **List**: 9 x 5 mm, 8 x 6 mm So far my

问题 I have a pattern as below: measurement = re.compile("(\d+(?:\.\d*)?)\s*x\s*(\d+(?:\.\d*)?)\s*(cm|mm|millimeter|centimeter|millimeters|centimeters)") It can be seen in several times in a sentence and in a document. I want to find all matches and replace it with "MEASUREMENT", also I want to add its value in a list. **Input_Text**: measuring 9 x 5 mm and previously measuring 8 x 6 mm **Output**: measuring MEASUREMENT and previously measuring MEASUREMENT **List**: 9 x 5 mm, 8 x 6 mm So far my

问题 I need to be able to match the word "internet" outside of quotations. e;g Internet "InternetFormula works and it's internetformula" Internet "The internet works" But I have no idea how to do so as Regular Expressions is complicated, and I can't find anything like it. 回答1: \bInternet\b(?=(?:[^"]*"[^"]*")*[^"]*$) You can try this.See demo. https://www.regex101.com/r/fG5pZ8/22 回答2: According to The Greatest Regex Trick Ever, you could use simply the following: "[^"]*"|\b(Internet)\b DEMO All

问题 I can't find the regex for strings containing only whitespaces or integers. The string is an input from user on keyboard. It can contain everything but \n (but it doesn't matter I guess), but we can focus on ASCII since it's supposed to be English sentences Here are some examples: OK: '1' '2 3' ' 3 56 ' '8888888 333' ' 039' not OK: 'a' '4 e' '874 1231 88 qqqq 99' ' shf ie sh f 8' I have this which finds the numbers: t = [int(i) for i in re.findall(r'\b\d+\b', text)] But I can't get the regex.

问题 I can't find the regex for strings containing only whitespaces or integers. The string is an input from user on keyboard. It can contain everything but \n (but it doesn't matter I guess), but we can focus on ASCII since it's supposed to be English sentences Here are some examples: OK: '1' '2 3' ' 3 56 ' '8888888 333' ' 039' not OK: 'a' '4 e' '874 1231 88 qqqq 99' ' shf ie sh f 8' I have this which finds the numbers: t = [int(i) for i in re.findall(r'\b\d+\b', text)] But I can't get the regex.

来源： https://stackoverflow.com/questions/62637354/propensity-score-matching-in-r

来源： https://stackoverflow.com/questions/62637354/propensity-score-matching-in-r