regex

问题 I have a python code and i'm reading a certificate and matching only the root cert. For ex my certificate is as below: --------begin certificate-------- CZImiZPyLGQBGRYFbG9jYWwxGjAYBgoJkiaJk/IasdasdassZAEZFgp2aXJ0dWFsdnB4MSEw HwYDVQQDExh2aXJ0dWFsdnB4LVZJUlRVQUxEQzEtQ0EwHhfdgdgdgfcNMTUwOTE2MTg1MTMx WhcNMTcwOTE2MTkwMTMxWjBaMQswCQYDVQQGEwJVUzEXMBUGCgmSJoaeqasadsmT8ixkARkW B3ZzcGhlcmUxFTATBgoJkiaJk/IsZAEZFgVsb2NhbDEOMAwGA1UEChMFdmNlcnfrrfgfdvQx CzAJBgNVBAMTAkNBMIIBIjANBgkqhkiG9w --------end

问题 I'm a noob with regex. I have to match literally different combinations of strings. Like in the example: "feed the cat." "feed the dog." "feed the bear." but NOT "feed the eagle." "feed the monkey." "feed the donkey." I tried something like /^feed the [cat|dog|bear].$/ but it doesn't work. The cheatsheet available on the net explain a lot of complicated things, but not how I can match several strings literally... Thank you for the help. 回答1: You're slightly confusing some syntax. Here's the

问题 I wonder if there is a way to refer to the group captured in same expression when using REGEXEXTRACT() in Google Sheets? Let's say we have a sample string: aaa123bbb123ccc456ddd123eee123fff456ggg and we'd like to extract the part where some 3 digits occure at least 3 times. Normally I would use regex like this: (\d{3})(?:[^\1]*\1){2,} but how to refer to the first group in =REGEXEXTRACT(A1;"(\d{3})(?:[^\1]*\1){2,}") ? This one returns error in Sheets. 回答1: There is no backreference support in

问题 I'd like to capture all the numbers in a string and return a vector of integers, something like this (the result can be an empty vector): fn str_strip_numbers(s: &str) -> Vec<isize> { unimplemented!() } A Python prototype: def str_strip_numbers(s): """ Returns a vector of integer numbers embedded in a string argument. """ return [int(x) for x in re.compile('\d+').findall(s)] For "alfa" the result is [] , for "42by4" it is [42, 4] . What is the idiomatic way to get it in Rust? UPD: fn str

问题 To match any non-word and non-digit character (special characters) I use this: [\\W\\D] . What should I add if I want to also ignore some concrete characters? Let's say, underscore. 回答1: First of all, you must know that \W is equivalent to [^a-zA-Z0-9_] . So, you can change your current regex to: [\\W] This will automatically take care of \D . Now, if you want to ignore some other character, say & (underscore is already exluded in \W ), you can use negated character class: [^\\w&] 来源： https:/

问题 As the title indicates, what is the difference between $/ and $¢ ? They appear to always have the same value: my $text = "Hello world"; $text ~~ /(\w+) { say $/.raku } (\w+)/; $text ~~ /(\w+) { say $¢.raku } (\w+)/; Both result in Match objects with the same values. What's the logic in using one over the other? 回答1: The variable $/ refers to the most recent match while the variable $¢ refers to the most recent outermost match. In most basic regexes like the above, that may be one and the same

问题 I have a file containing text: hello mayank1 kumar mayank21 yadav Kevin has at most K K minutes to perform this operations. He decides mayank3 that the string is super mayank4 if it is the lexicographically smallest among all possible strings mayank15 that he can get. Your task is to help Kevin and find this mayank2 lexicographically mayank8 smallest string mayank9 How can i find all mayank<number> ? I tried: use strict; open( FH, "testfile.txt" ) or die "Can't open file for reading."; while

问题 Is it possible to create a regex to match two sets with equal length? For example: I would like to match aabb and aaaabbbb but not aaaabb . What I want is something like [a]+[b]+ , but with with both of those having equal length, so something like [a]{x}[b]{x} where x is a possible length. Is it possible to do this with one javascript regex, should I use multiple regexes for the multiple possibilities (I dont think I will need to check for length 32 or higher) or should I code it in myself?

问题 I am going to extract the bbcode with the quotes but to no avail when the actual output is coming. I would like to implement the bbcode parsing module for extracting the quotes as desired output . The number of quotes shall be a recursive method or some else.. INput : Testing [quote]http://www.yourube.com?watch?v=asasdsadsa [url] aisa [/url] [/quote] Testing Desired Output Testing http://www.yourube.com?watch?v=asasdsadsa [url] aisa [/url] aisa Testing Actual Output: http://www.yourube.com

问题 I want to get a collection {value} of a string using Regular Expression . For example: lorem ipsum {field1} lorem ipsum {field2} lorem ipsum field1 lorem ipsum field2 {{field3}} I would get: {field1} and {field2} I try this: string pattern =@"\[(?>[^\{\}]+)*\]"; MatchCollection matches = Regex.Matches(text, pattern); for (int ctr = 0; ctr < matches.Count; ctr++) { string field = matches[ctr].Value; // ... ommitted... } Any suggestions? 回答1: You can use negative lookarounds to only get the {..