Ok i have a string where i want to remove the last word split by \
for example:
string name ="kak\kdk\dd\ddew\cxz\"
now i want to remove the last word so that i get a new value for name as
name= "kak\kdk\dd\ddew\"
is there an easy way to do this
thanks
How do you get this string in the first place? I assume you know that '' is the escape character in C#. However, you should get far by using
name = name.TrimEnd('\\').Remove(name.LastIndexOf('\\') + 1);
string result = string.Join("\\",
"kak\\kdk\\dd\\ddew\\cxz\\"
.Split(new[] { '\\' }, StringSplitOptions.RemoveEmptyEntries)
.Reverse()
.Skip(1)
.Reverse()
.ToArray()) + "\\";
Here's a non-regex manner of doing it.
string newstring = name.SubString(0, name.SubString(0, name.length - 1).LastIndexOf('\\'));
This regex replacement should do the trick:
name = Regex.Replace(name, #"\\[a-z]*\\$", "\\");
Try this:
const string separator = "\\";
string name = #"kak\kdk\dd\ddew\cxz\";
string[] names = name.Split(separator.ToCharArray(),
StringSplitOptions.RemoveEmptyEntries);
string result = String.Join(separator, names, 0, names.Length - 1) + separator;
EDIT:I just noticed that name.Substring(0,x) is equivalent to name.Remove(x), so I've changed my answer to reflect that.
In a single line:
name = name = name.Remove(name.Remove(name.Length - 1).LastIndexOf('\\') + 1);
If you want to understand it, here's how it might be written out (overly) verbosely:
string nameWithoutLastSlash = name.Remove(name.Length - 1);
int positionOfNewLastSlash = nameWithoutLastSlash.LastIndexOf('\\') + 1;
string desiredSubstringOfName = name.Remove(positionOfNewLastSlash);
name = desiredSubstringOfName;
My Solution
public static string RemoveLastWords(this string input, int numberOfLastWordsToBeRemoved, char delimitter)
{
string[] words = input.Split(new[] { delimitter });
words = words.Reverse().ToArray();
words = words.Skip(numberOfLastWordsToBeRemoved).ToArray();
words = words.Reverse().ToArray();
string output = String.Join(delimitter.ToString(), words);
return output;
}
Function call
RemoveLastWords("kak\kdk\dd\ddew\cxz\", 1, '\')
string name ="kak\kdk\dd\ddew\cxz\"
string newstr = name.TrimEnd(#"\")
if you working with paths:
string name = #"kak\kdk\dd\ddew\cxz\";
Path.GetDirectoryName(name.TrimEnd('\\'));
//ouput: kak\kdk\dd\ddew
string[] temp = name.Split('\\');
string last = "\\" + temp.Last();
string target = name.Replace(last, "");
For Linq-lovers: With later C# versions you can use SkipLast together with Split and string.Join:
var input = #"kak\kdk\dd\ddew\cxz\";
string result = string.Join( #"\", input
.Split( #"\", StringSplitOptions.RemoveEmptyEntries )
.SkipLast( 1 ))
+ #"\";
Related
I have a string say
var str = "xy,yz,zx,ab,bc,cd";
and I want to split it on the 2nd last occurrence of a comma in C# i.e
a = "xy,yz,zx,ab"
b = "bc,cd"
How can I achieve this result?
Let's find the required comma index with a help of LastIndexOf:
var str = "xy,yz,zx,ab,bc,cd";
// index of the 2nd last occurrence of ','
int index = str.LastIndexOf(',', str.LastIndexOf(',') - 1);
Then use Substring:
string a = str.Substring(0, index);
string b = str.Substring(index + 1);
Let's have a look:
Console.WriteLine(a);
Comsole.WriteLine(b);
Outcome:
xy,yz,zx,ab
bc,cd
Alternative "readable" approach ;)
const string text = "xy,yz,zx,ab,bc,cd";
var words = text.Split(',');
var firstBatch = Math.Max(words.Length - 2, 0);
var first = string.Join(",", words.Take(firstBatch));
var second = string.Join(",", words.Skip(firstBatch));
first.Should().Be("xy,yz,zx,ab"); // Pass OK
second.Should().Be("bc,cd"); // Pass OK
You could handle this via regex replacement:
var str = "xy,yz,zx,ab,bc,cd";
var a = Regex.Replace(str, #",[^,]+,[^,]+$", "");
var b = Regex.Replace(str, #"^.*,([^,]+,[^,]+)$", "$1");
Console.WriteLine(a);
Console.WriteLine(b);
This prints:
xy,yz,zx,ab
bc,cd
It you get Microsoft's System.Interactive extensions from NuGet then you can do this:
string output = String.Join(",", str.Split(',').TakeLast(2));
How do I replace word in string except first occurrence using c#
for example
string s= "hello my name is hello my name hello";
replace hello with x
output should be string news = "hello my name is x my name x";
I tried like works fine
string originalStr = "hello my hello ditch hello";
string temp = "hello";
string str = originalStr.Substring(0, originalStr.IndexOf(temp) + temp.Length);
originalStr = str + originalStr.Substring(str.Length).Replace(temp, "x");
can I have Regex expression for above code ?
This will do it for a general pattern:
var matchPattern = Regex.Escape("llo");
var replacePattern = string.Format("(?<={0}.*){0}", matchPattern);
var regex = new Regex(replacePattern);
var newText = regex.Replace("hello llo llo", "x");
If you want to only match and replace whole words, edit your pattern accordingly:
var matchPattern = #"\b" + Regex.Escape("hello") + #"\b";
Try this:
string pat = "hello";
string tgt = "x";
string tmp = s.Substring(s.IndexOf(pat)+pat.Length);
s = s.Replace(tmp, tmp.Replace(pat,tgt));
tmp is the substring of the original string starting after the end of first occurrence of the pattern to be replaced (pat). We then replace pat with the desired value (tgt) within this substring, and replace the substring in the original string with this updated value.
Demo
Do you need regex? You could use this little LINQ query and String.Join:
int wordCount = 0;
var newWords = s.Split()
.Select(word => word != "hello" || ++wordCount == 1 ? word : "x");
string newText = string.Join(" ", newWords);
But note that this will replace all white-spaces (even tabs or newlines) with a space.
I am having strings like below
<ad nameId="\862094\"></ad>
or comma seprated like below
<ad nameId="\862593\"></ad>,<ad nameId="\862094\"></ad>,<ad nameId="\865599\"></ad>
How to extract nameId value and store in single string like below
string extractedValues ="862094";
or in case of comma seprated string above
string extractedMultipleValues ="862593,862094,865599";
This is what I have started trying with but not sure
string myString = "<ad nameId="\862593\"></ad>,<ad nameId="\862094\"></ad>,<ad
nameId="\865599\"></ad>";
string[] myStringArray = myString .Split(',');
foreach (string str in myStringArray )
{
xd.LoadXml(str);
chkStringVal = xd.SelectSingleNode("/ad/#nameId").Value;
}
Search for:
<ad nameId="\\(\d*)\\"><\/ad>
Replace with:
$1
Note that you must search globally. Example: http://www.regex101.com/r/pL2lX1
Please see code below to extract all numbers in your example:
string value = #"<ad nameId=""\862093\""></ad>,<ad nameId=""\862094\""></ad>,<ad nameId=""\865599\""></ad>";
var matches = Regex.Matches(value, #"(\\\d*\\)", RegexOptions.RightToLeft);
foreach (Group item in matches)
{
string yourMatchNumber = item.Value;
}
Try like this;
string s = #"<ad nameId=""\862094\""></ad>";
if (!(s.Contains(",")))
{
string extractedValues = s.Substring(s.IndexOf("\\") + 1, s.LastIndexOf("\\") - s.IndexOf("\\") - 1);
}
else
{
string[] array = s.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
string extractedMultipleValues = "";
for (int i = 0; i < array.Length; i++)
{
extractedMultipleValues += array[i].Substring(array[i].IndexOf("\\") + 1, array[i].LastIndexOf("\\") - array[i].IndexOf("\\") - 1) + ",";
}
Console.WriteLine(extractedMultipleValues.Substring(0, extractedMultipleValues.Length -1));
}
mhasan, here goes an example of what you need(well almost)
EDITED: complete code (it's a little tricky)
(Sorry for the image but i have some troubles with tags in the editor, i can send the code by email if you want :) )
A little explanation about the code, it replaces all ocurrences of parsePattern in the given string, so if the given string has multiple tags separated by "," the final result will be the numbers separated by "," stored in parse variable....
Hope it helps
I am having an output in string format like following :
"ABCDED 0000A1.txt PQRSNT 12345"
I want to retreieve substring(s) having .txt in above string. e.g. For above it should return 0000A1.txt.
Thanks
You can either split the string at whitespace boundaries like it's already been suggested or repeatedly match the same regex like this:
var input = "ABCDED 0000A1.txt PQRSNT 12345 THE.txt FOO";
var match = Regex.Match (input, #"\b([\w\d]+\.txt)\b");
while (match.Success) {
Console.WriteLine ("TEST: {0}", match.Value);
match = match.NextMatch ();
}
Split will work if it the spaces are the seperator. if you use oter seperators you can add as needed
string input = "ABCDED 0000A1.txt PQRSNT 12345";
string filename = input.Split(' ').FirstOrDefault(f => System.IO.Path.HasExtension(f));
filname = "0000A1.txt" and this will work for any extension
You may use c#, regex and pattern, match :)
Here is the code, plug it in try. Please comment.
string test = "afdkljfljalf dkfjd.txt lkjdfjdl";
string ffile = Regex.Match(test, #"\([a-z0-9])+.txt").Groups[1].Value;
Console.WriteLine(ffile);
Reference: regexp
I did something like this:
string subString = "";
char period = '.';
char[] chArString;
int iSubStrIndex = 0;
if (myString != null)
{
chArString = new char[myString.Length];
chArString = myString.ToCharArray();
for (int i = 0; i < myString.Length; i ++)
{
if (chArString[i] == period)
iSubStrIndex = i;
}
substring = myString.Substring(iSubStrIndex);
}
Hope that helps.
First split your string in array using
char[] whitespace = new char[] { ' ', '\t' };
string[] ssizes = myStr.Split(whitespace);
Then find .txt in array...
// Find first element starting with .txt.
//
string value1 = Array.Find(array1,
element => element.Contains(".txt", StringComparison.Ordinal));
Now your value1 will have the "0000A1.txt"
Happy coding.
How can i get all elements before comma(,) in a string in c#?
For e.g.
if my string is say
string s = "a,b,c,d";
then I want all the element before d i.e. before the last comma.So my new string shout look like
string new_string = "a,b,c";
I have tried split but with that i can only one particular element at a time.
string new_string = s.Remove(s.LastIndexOf(','));
If you want everything before the last occurrence, use:
int lastIndex = input.LastIndexOf(',');
if (lastIndex == -1)
{
// Handle case with no commas
}
else
{
string beforeLastIndex = input.Substring(0, lastIndex);
...
}
Use the follwoing regex: "(.*),"
Regex rgx = new Regex("(.*),");
string s = "a,b,c,d";
Console.WriteLine(rgx.Match(s).Groups[1].Value);
You can also try:
string s = "a,b,c,d";
string[] strArr = s.Split(',');
Array.Resize(strArr, Math.Max(strArr.Length - 1, 1))
string truncatedS = string.join(",", strArr);