pattern-matching

问题 I'm replacing gregexpr with gregexpr2 to detect overlapping matches. When I try. >subSeq 3000-letter "DNAString" instance seq: ACACGTGTTCTATTTTCATTTGCTGACATTTTCTAGTGCATCATTTTTTATTTTATTTTCATT.... gregexpr2("TAAT|ATTA",subSeq) Error in matches[[i]] : subscript out of bounds whereas gregexpr("TAAT|ATTA",subSeq) works fine. What happened? 回答1: It is quite clear if you read gregexpr2 documentation: This is a replacement for the standard gregexpr function that does exact matching only. Standard

问题 I'm replacing gregexpr with gregexpr2 to detect overlapping matches. When I try. >subSeq 3000-letter "DNAString" instance seq: ACACGTGTTCTATTTTCATTTGCTGACATTTTCTAGTGCATCATTTTTTATTTTATTTTCATT.... gregexpr2("TAAT|ATTA",subSeq) Error in matches[[i]] : subscript out of bounds whereas gregexpr("TAAT|ATTA",subSeq) works fine. What happened? 回答1: It is quite clear if you read gregexpr2 documentation: This is a replacement for the standard gregexpr function that does exact matching only. Standard

问题 I'm replacing gregexpr with gregexpr2 to detect overlapping matches. When I try. >subSeq 3000-letter "DNAString" instance seq: ACACGTGTTCTATTTTCATTTGCTGACATTTTCTAGTGCATCATTTTTTATTTTATTTTCATT.... gregexpr2("TAAT|ATTA",subSeq) Error in matches[[i]] : subscript out of bounds whereas gregexpr("TAAT|ATTA",subSeq) works fine. What happened? 回答1: It is quite clear if you read gregexpr2 documentation: This is a replacement for the standard gregexpr function that does exact matching only. Standard

问题 We are experiencing problems with encoding, pattern matching using texts automatically downloaded from the web. We need some help to understand where the problem lies and how to fix it. Personally, I must confess that after having read so many posts on the topic, I am completely confused :-) Our texts sometimes include: 1) disturbing Unicode (I have read this already (Automatically escape unicode characters ), but I am not sure in which way it can help with regular expressions) 2) weird

问题 Just curious why I can't do this: let myFn (data : obj) = match data with | :? (string * string) as (s1, s2) -> sprintf "(%s, %s)" s1 s2 |> Some | :? (string * string * int) as (s1, s2, i) -> sprintf "(%s, %s, %d)" s1 s2 i |> Some | _ -> None How come? 回答1: See F# spec, section 7.3 "As patterns" An as pattern is of the form pat as ident Which means you need to use an identifier after as : let myFn (data : obj) = match data with | :? (string * string) as s1s2 -> let (s1, s2) = s1s2 in sprintf

问题 I'm trying to write some very basic code, but I'm also challenging myself on regular expression. I've been able to muddle through the code up to a point, but where I'm really having a problem is that I'm trying to run a do...while loop while the expression is false. At this point in time I get absolutely no errors, but the do...while loop keeps running. I'm attaching the relevant code below, here's hoping it helps. Thank you in advance if (tollResponse == "yes") { Console.WriteLine("How much

问题 I'm trying to replace the last two digits of number with " XX BLOCK " if it occurs at the start of the string and has more than 2 digits. I'm using the Microsoft VBScript Regular Expressions 5.5 reference. Dim regEx As New RegExp With regEx .Global = True 'Matches whole string, not just first occurrence .IgnoreCase = True 'Matches upper or lowercase .MultiLine = True 'Checks each line in case cell has multiple lines .pattern = "^(\d{2,})" 'Checks beginning of string for at least 2 digits End

问题 I'm trying to replace the last two digits of number with " XX BLOCK " if it occurs at the start of the string and has more than 2 digits. I'm using the Microsoft VBScript Regular Expressions 5.5 reference. Dim regEx As New RegExp With regEx .Global = True 'Matches whole string, not just first occurrence .IgnoreCase = True 'Matches upper or lowercase .MultiLine = True 'Checks each line in case cell has multiple lines .pattern = "^(\d{2,})" 'Checks beginning of string for at least 2 digits End

问题 I want to extract IBAN numbers from text with Python. The challenge here is, that the IBAN itself can be written in so many ways with spaces bewteen the numbers, that I find it difficult to translate this in a usefull regex pattern. I have written a demo version which tries to match all German and Austrian IBAN numbers from text. ^DE([0-9a-zA-Z]\s?){20}$ I have seen similar questions on stackoverflow. However, the combination of different ways to write IBAN numbers and also extracting these

问题 I want to extract IBAN numbers from text with Python. The challenge here is, that the IBAN itself can be written in so many ways with spaces bewteen the numbers, that I find it difficult to translate this in a usefull regex pattern. I have written a demo version which tries to match all German and Austrian IBAN numbers from text. ^DE([0-9a-zA-Z]\s?){20}$ I have seen similar questions on stackoverflow. However, the combination of different ways to write IBAN numbers and also extracting these