substring

问题 I am just trying to extract the date's year , month and day separately so that I can use it as per my wish. I stored the current date in $today and used substr() to extract the strings from it. But I am getting some strange behaviour from what I am doing. My current code: $today = date("Y/m/d"); $_year = substr($today, 0,4); $_month = substr($today, 5,7); $_day = substr($today, 8, 10); echo $_year . " " . $_month; The $_year works correctly as expected but the problem arises from $_month , no

问题 I am just trying to extract the date's year , month and day separately so that I can use it as per my wish. I stored the current date in $today and used substr() to extract the strings from it. But I am getting some strange behaviour from what I am doing. My current code: $today = date("Y/m/d"); $_year = substr($today, 0,4); $_month = substr($today, 5,7); $_day = substr($today, 8, 10); echo $_year . " " . $_month; The $_year works correctly as expected but the problem arises from $_month , no

问题 I new in flutter, and i need your help for something. Can anyone help me how can i write this code line form JavaScript to Flutter: onInputChange(event, backspace) { let newVal = event.replace(/\D/g, ''); if (backspace && newVal.length <= 6) { newVal = newVal.substring(0, newVal.length - 1); } if (newVal.length === 0) { newVal = ''; } else if (newVal.length <= 3) { newVal = newVal.replace(/^(\d{0,3})/, '($1)'); } else if (newVal.length <= 6) { newVal = newVal.replace(/^(\d{0,3})(\d{0,3})/, '(

问题 This question already has answers here : Fastest way to remove first char in a String (4 answers) Closed 4 years ago . I wonder if it's a better practice to use : var a = b.Substring(6); Or var a = b.Remove(0,6); Which one is more efficient / faster ? Obviously substring has more options you can pick from but nothing that Remove() cant do.. Sorry if it's newbie question, I'm new to C# 回答1: Looking at the code using reflector, InternalSubString is doing only one wstrcpy whereas Remove is doing

问题 This question already has answers here : Pandas filtering for multiple substrings in series (3 answers) Closed 2 years ago . I have a pandas dataframe which I want to check for substrings of a certain column. At the moment I have 30 lines of code of this kind: df['NAME'].str.upper().str.contains('LIMITED')) | (df['NAME'].str.upper().str.contains('INC')) | (df['NAME'].str.upper().str.contains('CORP')) They are all linked with an or condition and if any of them is true, the name is the name of

问题 I have many strings which have multiple spaces and one forward slash like this: string a="xxxxxx xxx xxxxxxxx xxxxxx aaa/xxxxxxxxxxxxxxx"; or string b="xxxx xxx xxxxxx bbbbb/xxxxxxx xxx"; or string c="xx xx 12345/x xx" What I need to do is to replace the substring "aaa" or "bbbbb" or "12345" ( Please note that the substrings are just examples, they can be anything ) with the new string I want. The feature for the substring "aaa" or "bbbbb" or "12345" or anything is that the substring is right

问题 I have many strings which have multiple spaces and one forward slash like this: string a="xxxxxx xxx xxxxxxxx xxxxxx aaa/xxxxxxxxxxxxxxx"; or string b="xxxx xxx xxxxxx bbbbb/xxxxxxx xxx"; or string c="xx xx 12345/x xx" What I need to do is to replace the substring "aaa" or "bbbbb" or "12345" ( Please note that the substrings are just examples, they can be anything ) with the new string I want. The feature for the substring "aaa" or "bbbbb" or "12345" or anything is that the substring is right

问题 I have many strings which have multiple spaces and one forward slash like this: string a="xxxxxx xxx xxxxxxxx xxxxxx aaa/xxxxxxxxxxxxxxx"; or string b="xxxx xxx xxxxxx bbbbb/xxxxxxx xxx"; or string c="xx xx 12345/x xx" What I need to do is to replace the substring "aaa" or "bbbbb" or "12345" ( Please note that the substrings are just examples, they can be anything ) with the new string I want. The feature for the substring "aaa" or "bbbbb" or "12345" or anything is that the substring is right

问题 This question has been asked and answered plenty of times before. However, I'm specifically asking for the substrings to be printed in the specific order by each letter as shown in the output. import java.util.*; public static void main(String[] args) { breakWordIntoPieces("ABIGWORD"); } public static void breakWordIntoPieces(String str) { if (str.length() > 1) // I'm skipping all substrings of less than 2 letters { List<String> fragments = breakWordIntoPiecesFromRightToLeft(str); for (String

问题 This question already has answers here : Generate all unique substrings for given string (14 answers) Closed 2 years ago . For String A = "abcd" then answer should be {a,ab,abc,abcd,b,bc,bcd,c,cd,d} To find all the substring I have used following method for (int i = 0; i < A.length(); i++) { for (int j = i+1; j <= A.length(); j++) { System.out.println(A.substring(i,j)); } } But according to my understanding the complexity goes to O(N^2) . Can we make it faster? I referred previous question