Replacing string literals in c# using Regex [closed] - c#

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I am trying to replace all string literals in a string, with placeholders. For example if I have the following string:
string s1 = "foo"; string s2 = "bar"; string s3 = "baz";
I would like to replace this with:
string s1 = #0#; string s2 = #1#; string s2 = #2#;
and also retain the replaced string literals {"foo","bar", "baz"} in a data structure for later use.
I can do this through brute force ugly coding. However, I am wondering whether there is a nice way of doing this using regular expressions?
My attempt was:
MatchCollection textConstants = Regex.Matches(text, "\".*\"");
for (int i=0; i < textConstants.Count; i++)
{
text=text.Replace(textConstants[i].Value, "#" + i + "#");
}'
This does not seem very nice

And now you have two problems:
var s = "string s1 = \"foo\"; string s2 = \"bar\"; string s3 = \"baz\";";
var list = new List<string>();
var result = Regex.Replace(s, "\".*?\"", m => { list.Add(m.Value);
return "#" + (list.Count - 1) + "#"; });

Take a look at this msdn article. It's a good starting point on how to use regular expressions.
https://msdn.microsoft.com/en-us/library/xwewhkd1(v=vs.110).aspx

Related

Remove part of a string between an start and end

Code first:
string myString = "<at>onePossibleName</at> some question here regarding <at>disPossibleName</at>"
// some code to handle myString and save it in myEditedString
Console.WriteLine(myEditedString);
//output now is: some question here regarding <at>disPossibleName</at>
I want to remove <at>onePossibleName</at> from myString. The string onePossibleName and disPossbileName could be any other string.
So far I am working with
string myEditedString = string.Join(" ", myString.Split(' ').Skip(1));
The problem here would be that if onePossibleName becomes one Possible Name.
Same goes for the try with myString.Remove(startIndex, count) - this is not the solution.
There will be different method depending on what you want, you can go with a IndexOf and a SubString, regex would be a solution too.
// SubString and IndexOf method
// Usefull if you don't care of the word in the at tag, and you want to remove the first at tag
if (myString.Contains("</at>"))
{
var myEditedString = myString.Substring(myString.IndexOf("</at>") + 5);
}
// Regex method
var stringToRemove = "onePossibleName";
var rgx = new Regex($"<at>{stringToRemove}</at>");
var myEditedString = rgx.Replace(myString, string.Empty, 1); // The 1 precise that only the first occurrence will be replaced
You could use this generic regular expression.
var myString = "<at>onePossibleName</at> some question here regarding <at>disPossibleName</at>";
var rg = new Regex(#"<at>(.*?)<\/at>");
var result = rg.Replace(myString, "").Trim();
This would remove all 'at' tags and the content between. The Trim() call is to remove any white space at the beginning/end of the string after the replacement.
string myString = "<at>onePossibleName</at> some question here regarding <at>disPossibleName</at>"
int sFrom = myString.IndexOf("<at>") + "<at>".Length;
int sTo = myString.IndexOf("</at>");
string myEditedString = myString.SubString(sFrom, sFrom - sTo);
Console.WriteLine(myEditedString);
//output now is: some question here regarding <at>disPossibleName</at>

How to extract string between same char [closed]

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I have a string "ABD-DDD-RED-Large" and need to extract "DDD-RED"
using the Split I have:
var split = "ABD-DDD-RED-Large".Split('-');
var first = split[0];
var second = split[1];
var third = split[2];
var fourth = split[3];
string value = string.Join("-", second, third);
just wondering if there's a shorter code
If you just want the second and third parts of an always 4 part (delimited by -) string you can one line it with LINQ:
string value = string.Join("-", someInputString.Split('-').Skip(1).Take(2));
An input of: "ABD-DDD-RED-Large" would give you an output of: "DDD-RED"
Not enough information. You mentioned that string is not static. May be Regex?
string input = "ABD-DDD-RED-Large";
string pattern = #"(?i)^[a-z]+-([a-z]+-[a-z]+)";
string s = Regex.Match(input, pattern).Groups[1].Value;
Use regex
var match = Regex.Match(split, #".*?-(.*?-.*?)-.*?");
var value = match.Success ? match.Groups[1].Value : string.Empty;
I'm going out on a limb and assuming your string is always FOUR substrings divided by THREE hyphens. The main benefit of doing it this way is that it only requires the basic String library.
You can use:
int firstDelIndex = input.IndexOf('-');
int lastDelIndex = input.LastIndexOf('-');
int neededLength = lastDelIndex - firstDelIndex - 1;
result = input.Substring((firstDelIndex + 1), neededLength);
This is generic enough to not care what any of the actual inputs are except the hyphen character.
You may want to add a catch at the start of the method using this to ensure there are at least two hyphen's in the input string before trying to pull out the requested substring.

Select a part in a string C# [closed]

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I have string
string AccountName= "123456789 - Savings - 20$"
Now I want to select the Accountname Savings only. That means the part between -s.
That data is dynamic data. So, Could you please give me an idea to get the part of string between two -s. i.e AccountName= "Savings".
Thank you in advance..!!
One of the ways you can to that:
Split string by '-'
Get the position 1 of array
Trim value to remove spaces
var AccountNameSplited= AccountName.split('-')[1].Trim();
You should be defensive in this cases:
var AccountNameBt = AccountName.Split('-');
var AccountNameBtPos1 = string.Empty;
if (AccountNameBt != null && AccountNameBt.Count() > 0)
AccountNameBtPos1 =AccountNameBt[1].Trim();
Assuming your string will always have only two -s, you could using the following to get the substring between them. If this is not the case please modify the question to better describe the issue.
string myString = AccountName.Split('-')[1];
Check out https://msdn.microsoft.com/en-us/library/system.string.split(v=vs.110).aspx for more information on the Split method in the string class.
How about:
string AccountName = "123456789 - Savings - 20$";
String[] tokens = AccountName.Split(new[] { " - " }, StringSplitOptions.RemoveEmptyEntries);
AccountName = tokens.ElementAtOrDefault(1); // Savings
If it's possible that there are no spaces:
String[] tokens = AccountName.Split(new[] { '-' }, StringSplitOptions.RemoveEmptyEntries);
AccountName = tokens.ElementAtOrDefault(1)?.Trim();
Use Regex:
AccountName = Regex.Match(AccountName, #"-\s*(.*?)\s*-").Groups[1].Value;
Demo: https://dotnetfiddle.net/3Xr24T

How can I extract sub-string from string in c# code? [closed]

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How can I extract this sub-string "60684" from this string "/fa/Viewer/Switcher/60684/0" in c#?
You can use Split method :
string str = "/fa/12012/Switcher/60684/0";
string str2 = str.Split('/')[4];
One way is to use regex:
static void Main()
{
string pattern = #"\/[a-zA-Z]+\/[a-zA-Z]+\/[a-zA-Z]+\/([0-9]+)\/[a-z0-9]+";
var regex = new Regex(pattern);
string path = "/fa/Viewer/Switcher/60684/0";
var match = regex.Match(path);
Console.WriteLine(match.Groups[1].ToString());
}
Like this:
string url = #"/fa/12012/Switcher/60684/0";
string[] NumberAfterSwitcher = url.Split('/');
string num = (NumberAfterSwitcher.Length > 3) ? (String)url.Split('/').GetValue(3) : String.Empty;

How to format a very long text on a TextBox? [closed]

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How to format my text in TextBox?
My text value is:
00010001008002020100010000530997000014820000148200010000012C00001482000014820000148200010000012C000014820000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000101000000000000000000000000000000000000003F
And I want my output to be like this:
00010001-0080-02020100010000-53099700-00148200-00-14820001-0000-012C0000-14820000-1482000-0148-20001000-0012C000-0148-20000000-00000000-0000-00-000000000-00000000-0000-00000000-0000000-0000-00000000-00000000-00000000-0000-00000000-00-00000-000001010-00000000-000000000-0000-000000000-00000003-F
Your format must be fixed. It should not be dynamic.
I am just providing a logic you could append the further detail in regex string.
string mystring = "000100010080"
string regex = #"(\w{4})(\w{4})(\w{4})";
string strValue = Regex.Replace(mystring, regex, #"$1-$2-$3");
OUTPUT:
0001-0001-0080
EDITED: Take a look at complete example
string[] patern = "XXXXXXXX-XXXX-XXXXXXXXXXXXXX-XXXXXXXX-XXXXXXXX-XX-XXXXXXXX-
XXXX-XXXXXXXX-XXXXXXXX-XXXXXXX-XXXX-XXXXXXXX-XXXXXXXX-XXXX-
XXXXXXXX-XXXXXXXX-XXXX-XX-XXXXXXXXX-XXXXXXXX-XXXX-XXXXXXXX-
XXXXXXX-XXXX-XXXXXXXX-XXXXXXXX-XXXXXXXX-XXXX-XXXXXXXX-XX-
XXXXX-XXXXXXXXX-XXXXXXXX-XXXXXXXXX-XXXX-XXXXXXXXX-XXXXXXXX-
X".Split('-');
string mystring = "00010001008002020100010000530997000014820000148200010000012C0
0001482000014820000148200010000012C00001482000000000000000000
0000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000001010000000000000000000000000000
00000000003F";
string regex = string.Empty;
string match = string.Empty;
for(int i=0; i<patern.Length;i++)
{
regex += #"(\w{" + patern[i].Length + "})";
match += "$" + (i + 1).ToString() + "-";
}
match = match.Substring(0, match.Length - 1);
txtMyTextBox.Text = Regex.Replace(mystring, regex, match);
Assuming that you have a fixed pattern of inserting hyphens and the string length is same every time, then you could do something like this:
int[] indices = new int[] { 2, 5, 11 };
string yourLongString = "blahblahblah";
foreach( var index in indices.Reverse() )
{
yourLongString = yourLongString.Insert( index - 1, "-" );
}
OR
Assuming you have no predefined pattern, you could insert hyphens anywhere and hence still you could use the same code above with the tweak to randomize the indices array, if needed.

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