Usually, we can easily get a String value between two characters. My question is, how do I get the value between two same characters.
For example:
String full_value = "http://stackoverflow.com/questions/9367119/title-goes-here";
In this example, how can I extract the value 9367119 from the entire string?
The solution that I use doesn't work since 9367119 has the same / characters to the right and left of it.
Here's what I have so far:
This works for values that doesn't have two same characters to the left and right. Such as: /dog\ I can easily replace / and \ with my solution
public static string Between(string full_value, string a, string b)
{
int posA = full_value.IndexOf(a);
int posB = full_value.LastIndexOf(b);
if (posA == -1)
{
return "";
}
if (posB == -1)
{
return "";
}
int adjustedPosA = posA + a.Length;
if (adjustedPosA >= posB)
{
return "";
}
return full_value.Substring(adjustedPosA, posB - adjustedPosA);
}
You could just Split and get the relevant part:
string s = "http://stackoverflow.com/questions/9367119/title-goes-here";
string[] sp = s.Split('/');
Console.WriteLine(sp[4]);
IdeOne demo.
Use following regex:
(?<=/)\d+(?=/)
String full_value = "http://stackoverflow.com/questions/9367119/title-goes-here";
var matches = Regex.Matches(full_value, #"(?<=/)\d+(?=/)");
try this way use Split
string s = "http://stackoverflow.com/questions/9367119/title-goes-here";
string[] sps = s.Split('/');
foreach(string sp in sps ){
if(sp =="9367119"){
Console.WriteLine(sp);
}
}
Related
I have a string like AX_1234X_12345_X_CXY, I want to remove X from after the first underscore _ i.e. from 1234X to 1234. So final output will be like AX_1234_12345_X_CXY. How to do it?? If I use .Replace("X", "") it will replace all X which I don't want
You can iterate trough the string from the first occurrence of '_' .
you can find the first occurrence of '_' using IndexOf().
when loop will get to 'X' it will not append it to the "fixed string".
private static void Func()
{
string Original = "AX_1234X_12345_X_CXY";
string Fixed = Original.Substring(0, Original.IndexOf("_", 0));
// in case you want to remove all 'X`s' after first occurrence of `'_'`
// just dont use that variable
bool found = false;
for (int i = Original.IndexOf("_", 0); i < Original.Length; i++)
{
if (Original[i].ToString()=="X" && found == false)
{
found = true;
}
else
{
Fixed += Original[i];
}
}
Console.WriteLine(Fixed);
Console.ReadLine();
}
Why not good old IndexOf and Substring?
string s = "AX_1234X_12345_X_CXY";
int pUnder = s.IndexOf('_');
if (pUnder >= 0) { // we have underscope...
int pX = s.IndexOf('X', pUnder + 1); // we should search for X after the underscope
if (pX >= 0) // ...as well as X after the underscope
s = s.Substring(0, pX) + s.Substring(pX + 1);
}
Console.Write(s);
Outcome:
AX_1234_12345_X_CXY
string original = #"AX_1234X_12345_X_CXY";
original = #"AX_1234_12345_X_CXY";
One way is String.Remove, because you can tell exactly where to remove from. If the offending "X" is always in the same place, you can use:
string newString = old.Remove(7,1);
This will remove 1 character starting as position 7 (counting from zero as the beginning of the string).
If not always in the same character position, you might try:
int xPos = old.IndexOf("X");
string newString = old.Remove(xPos,1);
EDIT:
Based on OP comment, the "X" we're targeting occurs just after the first underscore character, so let's index off of the first underscore:
int iPosUnderscore = old.IndexOf("_");
string newString = old.Remove(iPosUnderscore + 1 ,1); // start after the underscore
Try looking at string.IndexOf or string.IndexOfAny
string s = "AX_1234X_12345_X_CXY";
string ns = HappyChap(s);
public string HappyChap(string value)
{
int start = value.IndexOf("X_");
int next = start;
next = value.IndexOf("X_", start + 1);
if (next > 0)
{
value = value.Remove(next, 1);
}
return value;
}
If and only if this is always the format then it should be a simple matter of combining substrings of the original text without including the x in that position. But the op hasn't stated that this is always the case. So if this is always the format and the same character position is always removed then you could simply just
string s = "AX_1234X_12345_X_CXY";
string newstring = s.Substring(0, 7) + s.Substring(8);
OK, based on only the second set of numbers being variable in length, you could then do something like:
int startpos = s.IndexOf('_', 4);
string newstring = s.Substring(0, startpos - 1) + s.Substring(startpos);
with this code, the following tests resulted in:
"AX_1234X_12345_X_CXY" became "AX_1234_12345_X_CXY"
"AX_123X_12345_X_CXY" became "AX_123_12345_X_CXY"
"AX_234X_12345_X_CXY" became "AX_234_12345_X_CXY"
"AX_1X_12345_X_CXY" became "AX_1_12345_X_CXY"
Something like this could work. I'm sure there's a more elegant solution.
string input1 = "AX_1234X_12345_X_CXY";
string pattern1 = "^[A-Z]{1,2}_[0-9]{1,4}(X)";
string newInput = string.Empty;
Match match = Regex.Match(input1, pattern1);
if(match.Success){
newInput = input1.Remove(match.Groups[1].Index, 1);
}
Console.WriteLine(newInput);
I have a string of text and want to ensure that it contains at most one single occurrence of a specific character (,). Therefore I want to keep the first one, but simply remove all further occurrences of that character.
How could I do this the most elegant way using C#?
This works, but not the most elegant for sure :-)
string a = "12,34,56,789";
int pos = 1 + a.IndexOf(',');
return a.Substring(0, pos) + a.Substring(pos).Replace(",", string.Empty);
You could use a counter variable and a StringBuilder to create the new string efficiently:
var sb = new StringBuilder(text.Length);
int maxCount = 1;
int currentCount = 0;
char specialChar = ',';
foreach(char c in text)
if(c != specialChar || ++currentCount <= maxCount)
sb.Append(c);
text = sb.ToString();
This approach is not the shortest but it's efficient and you can specify the char-count to keep.
Here's a more "elegant" way using LINQ:
int commasFound = 0; int maxCommas = 1;
text = new string(text.Where(c => c != ',' || ++commasFound <= maxCommas).ToArray());
I don't like it because it requires to modify a variable from a query, so it's causing a side-effect.
Regular expressions are elegant, right?
Regex.Replace("Eats, shoots, and leaves.", #"(?<=,.*),", "");
This replaces every comma, as long as there is a comma before it, with nothing.
(Actually, it's probably not elegant - it may only be one line of code, but it may also be O(n^2)...)
If you don't deal with large strings and you reaaaaaaly like Linq oneliners:
public static string KeepFirstOccurence (this string #string, char #char)
{
var index = #string.IndexOf(#char);
return String.Concat(String.Concat(#string.TakeWhile(x => #string.IndexOf(x) < index + 1)), String.Concat(#string.SkipWhile(x=>#string.IndexOf(x) < index)).Replace(#char.ToString(), ""));
}
You could write a function like the following one that would split the string into two sections based on the location of what you were searching (via the String.Split() method) for and it would only remove matches from the second section (using String.Replace()) :
public static string RemoveAllButFirst(string s, string stuffToRemove)
{
// Check if the stuff to replace exists and if not, return the original string
var locationOfStuff = s.IndexOf(stuffToRemove);
if (locationOfStuff < 0)
{
return s;
}
// Calculate where to pull the first string from and then replace the rest of the string
var splitLocation = locationOfStuff + stuffToRemove.Length;
return s.Substring(0, splitLocation) + (s.Substring(splitLocation)).Replace(stuffToRemove,"");
}
You could simply call it by using :
var output = RemoveAllButFirst(input,",");
A prettier approach might actually involve building an extension method that handled this a bit more cleanly :
public static class StringExtensions
{
public static string RemoveAllButFirst(this string s, string stuffToRemove)
{
// Check if the stuff to replace exists and if not, return the
// original string
var locationOfStuff = s.IndexOf(stuffToRemove);
if (locationOfStuff < 0)
{
return s;
}
// Calculate where to pull the first string from and then replace the rest of the string
var splitLocation = locationOfStuff + stuffToRemove.Length;
return s.Substring(0, splitLocation) + (s.Substring(splitLocation)).Replace(stuffToRemove,"");
}
}
which would be called via :
var output = input.RemoveAllButFirst(",");
You can see a working example of it here.
static string KeepFirstOccurance(this string str, char c)
{
int charposition = str.IndexOf(c);
return str.Substring(0, charposition + 1) +
str.Substring(charposition, str.Length - charposition)
.Replace(c, ' ').Trim();
}
Pretty short with Linq; split string into chars, keep distinct set and join back to a string.
text = string.Join("", text.Select(c => c).Distinct());
I have strings that look like this:
1.23.4.34
12.4.67
127.3.2.21.3
1.1.1.9
This is supposed to be a collection of numbers, separated by '.' symbols, similar to an ip address. I need to increment only the last digit/digits.
Expected Output:
1.23.4.35
12.4.68
127.3.2.21.4
1.1.1.10
Basically, increment whatever the number that is after the last '.' symbol.
I tried this:
char last = numberString[numberString.Length - 1];
int number = Convert.ToInt32(last);
number = number + 1;
If I go with the above code, I just need to replace the characters after the last '.' symbol with the new number. How do I get this done, good folks? :)
It seems to me that one method would be to:
split the string on . to get an array of components.
turn the final component into an integer.
increment that integer.
turn it back into a string.
recombine the components with . characters.
See, for example, the following program:
using System;
namespace ConsoleApplication1 {
class Program {
static void Main(string[] args) {
String original = "1.23.4.34";
String[] components = original.Split('.');
int value = Int32.Parse(components[components.Length - 1]) + 1;
components[components.Length - 1] = value.ToString();
String newstring = String.Join(".",components);
Console.WriteLine(newstring);
}
}
}
which outputs the "next highest" value of:
1.23.4.35
You can use string.LastIndexOf().
string input = "127.3.2.21.4";
int lastIndex = input.LastIndexOf('.');
string lastNumber = input.Substring(lastIndex + 1);
string increment = (int.Parse(lastNumber) + 1).ToString();
string result = string.Concat(input.Substring(0, lastIndex + 1), increment);
You need to extract more than just the last character. What if the last character is a 9 and then you add 1 to it? Then you need to correctly add one to the preceding character as well. For example, the string 5.29 should be processed to become 5.30 and not simply 5.210 or 5.20.
So I suggest you split the string into its number sections. Parse the last section into an integer. Increment it and then create the string again. I leave it as an exercise for the poster to actually write the few lines of code. Good practice!
Something like this:
var ip = "1.23.4.34";
var last = int.Parse(ip.Split(".".ToCharArray(),
StringSplitOptions.RemoveEmptyEntries).Last());
last = last + 1;
ip = string.Format("{0}.{1}",ip.Remove(ip.LastIndexOf(".")) , last);
If you are dealing with IP, there will be some extra code in case of .034, which should be 035 instead of 35. But that logic is not that complicated.
It's simple as this, use Split() and Join() String methods
String test = "1.23.4.34"; // test string
String[] splits = test.Split('.'); // split by .
splits[splits.Length - 1] = (int.Parse(splits[splits.Length - 1])+1).ToString(); // Increment last integer (Note : Assume all are integers)
String answ = String.Join(".",splits); // Use string join to make the string from string array. uses . separator
Console.WriteLine(answ); // Answer : 1.23.4.35
Using a bit of Linq
int[] int_arr = numberString.Split('.').Select(num => Convert.ToInt32(num)).ToArray();
int_arr[int_arr.Length - 1]++;
numberString = "";
for(int i = 0; i < int_arr.Length; i++) {
if( i == int_arr.Length - 1) {
numberString += int_arr[i].ToString();
}
else {
numberString += (int_arr[i].ToString() + ".");
}
}
Note: on phone so can't test.
My Solution is:
private static string calcNextCode(string value, int index)
{
if (value is null) return "1";
if (value.Length == index + 1) return value + "1";
int lastNum;
int myIndex = value.Length - ++index;
char myValue = value[myIndex];
if (int.TryParse(myValue.ToString(), NumberStyles.Integer, null, out lastNum))
{
var aStringBuilder = new StringBuilder(value);
if (lastNum == 9)
{
lastNum = 0;
aStringBuilder.Remove(myIndex, 1);
aStringBuilder.Insert(myIndex, lastNum);
return calcNextCode(aStringBuilder.ToString(), index++);
}
else
{
lastNum++;
}
aStringBuilder.Remove(myIndex, 1);
aStringBuilder.Insert(myIndex, lastNum);
return aStringBuilder.ToString();
}
return calcNextCode(value, index++);
}
Suppose I have a string A, for example:
string A = "Hello_World";
I want to remove all characters up to (and including) the _. The exact number of characters before the _ may vary. In the above example, A == "World" after removal.
string A = "Hello_World";
string str = A.Substring(A.IndexOf('_') + 1);
You have already received a perfectly fine answer. If you are willing to go one step further, you could wrap up the a.SubString(a.IndexOf('_') + 1) in a robust and flexible extension method:
public static string TrimStartUpToAndIncluding(this string str, char ch)
{
if (str == null) throw new ArgumentNullException("str");
int pos = str.IndexOf(ch);
if (pos >= 0)
{
return str.Substring(pos + 1);
}
else // the given character does not occur in the string
{
return str; // there is nothing to trim; alternatively, return `string.Empty`
}
}
which you would use like this:
"Hello_World".TrimStartUpToAndIncluding('_') == "World"
string a = "Hello_World";
a = a.Substring(a.IndexOf("_")+1);
try this? or is the A= part in your A=Hello_World included?
var foo = str.Substring(str.IndexOf('_') + 1);
string orgStr = "Hello_World";
string newStr = orgStr.Substring(orgStr.IndexOf('_') + 1);
you can do this by creating a substring.
simple exampe is here:
public static String removeTillWord(String input, String word) {
return input.substring(input.indexOf(word));
}
removeTillWord("I need this words removed taken please", "taken");
Given :
string command = "<CP1><SSA1>";
string command_2 = "<CP1><MPS>";
How can I get the word "CP1" and "1" from 'SSA1' in command and for command_2 is "CP1" and "MPS" then set to another variables?
I already search the similar question but still not found the best answer.
Edited :
For command variable, I want get 'CP1' from CP1 and '1' from SSA1. And for command_2 variable I want get 'CP1' from CP1 and 'MPS' from MPS.
You just need to get strings between angled brackets.. then you just replace "SSA" with "" and you have all the words you wanted !!!
using System.IO;
using System;
using System.Text.RegularExpressions;
using System.Collections.Generic;
class Program
{
static void Main()
{
string command = "<CP1><SSA1>";
string command_2 = "<CP1><MPS>";
prnt(command);
prnt(command_2);
//prnt(command+command_2); //even this will work :)
}
private static void prnt(string str)
{
List<string> l = ExtractFromString(str,"<",">");
foreach(string ll in l)
Console.WriteLine(ll.Replace("SSA",""));
}
private static List<string> ExtractFromString(string text, string start, string end)
{
List<string> Matched = new List<string>();
int index_start = 0, index_end=0;
bool exit = false;
while(!exit)
{
index_start = text.IndexOf(start);
index_end = text.IndexOf(end);
if (index_start != -1 && index_end != -1)
{
Matched.Add(text.Substring(index_start + start.Length, index_end - index_start - start.Length));
text = text.Substring(index_end + end.Length);
}
else
exit = true;
}
return Matched;
}
}
Output:
CP1
1
CP1
MPS
Source of Extract method: Extract all strings between two strings
You're parsing XML, use XElement classes instead. Then use String or Regex classes to parse tag string content.
this is the code:
string s1 = "<CP1><SSA1>";
int start = s1.IndexOf("<CP");
int end = s1.IndexOf(">"); string
numString = s1.Substring(start + 3, end-start-3); // get the 1
start = s1.IndexOf("<SSA");
end = s1.Length-1;
numString = s1.Substring(start + 4, end - start - 4); // get the 1
with this code you should receive the numbers after your token, it's doesn't matter how much digits it contain.
To convert the string to int use Parse function, like this: int.Parse(numString)
Same answer to the second string
#Chuki2
I dont know what exactly you want to achieve.. but it could be a way to do this.. check it out below..!!
string command = "<CP1><SSA1>";
string command_2 = "<CP1><MPS>";
command = command.Replace("<", "#").Replace(">", "#");
command_2 = command_2.Replace("<", "#").Replace(">", "#");
string[] val = command.Split(
new char[]{'#'},
StringSplitOptions.RemoveEmptyEntries
);
string[] val_2 = command_2.Split(
new char[] { '#' },
StringSplitOptions.RemoveEmptyEntries
);
//now because you want to get the only "1" from "SSA1"
//well i dont know what really you want to do but it could be one way to do this.
string lastParameter = val[val.Length-1];
val[val.Length - 1] = lastParameter.Substring(lastParameter.Length - 1);
Another way:
string[] parts = command.Split(new char[] {'<', '>'},StringSplitOptions.RemoveEmptyEntries);
string part1 = parts[0];
string part2 = parts[1].StartsWith("SSA") : parts[1].Substring(3) : parts[1];