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How to find and get string after a string known values in a text file c#

I want to find and get a string after a string known values in a text file with c#
My text file:
function PreloadFiles takes nothing returns nothing
call Preload( "=== Save ===" )
call Preload( "Player: Michael" )
call Preload( "-load1 UvjkiJyjLlPN1o7FCAwQ0en80t769u5uBKAL1t0u0Cajk86WNmp83F" )
call Preload( "-load2 IMdOIPKGSDFXStx4Zd4LAvAaBmHW19rxsvSNF6kaObSFyBzGq8skYGuq0T1eW" )
call Preload( "-load3 Bd6MoyqnfDydBbwqGApWii3mabJpwNvjcwrKLI0r6UU2wadrMV1h7WQ8D6" )
call Preload( "-load4 D5kI18Flk5bJ4Oi7vQw33b5LHDXHGgJNYsiC6VNJDAHe1" )
call Preload( "KEY PASS: 3568" )
endfunction
i want to get string after string "-load1" ,"-load2" ,"-load3" ,"-load4" ,"KEY PASS: " and fill them on 5 Textbox
like that
UvjkiJyjLlPN1o7FCAwQ0en80t769u5uBKAL1t0u0Cajk86WNmp83F
IMdOIPKGSDFXStx4Zd4LAvAaBmHW19rxsvSNF6kaObSFyBzGq8skYGuq0T1eW
Bd6MoyqnfDydBbwqGApWii3mabJpwNvjcwrKLI0r6UU2wadrMV1h7WQ8D6
D5kI18Flk5bJ4Oi7vQw33b5LHDXHGgJNYsiC6VNJDAHe1
3568
Please help me
Thanks you!

you can use
string Substring (int startIndex);
like:
string in1 = "-load1 UvjkiJyjLlPN1o7FCAwQ0en80t769u5uBKAL1t0u0Cajk86WNmp83F";
string out = in1.substring(7);
it returns:
"UvjkiJyjLlPN1o7FCAwQ0en80t769u5uBKAL1t0u0Cajk86WNmp83F"

It is possible to do with Regex class (from System.Text.RegularExpressions namespace).
Patterns examples:
for -loadN ... string: " [A-Za-z0-9]*\" ". It means Regex should look for substring which starts with whitespace " " contains some amount of chars (A-z) (of any case) or digits (0-9) and ends with double quote \" and whitespace " ". Such as yours UvjkiJyjLlP..." .
for KEY PASS: ... string: #"KEY PASS: (\d{4})". This means Regex should find a substring which contains "KEYPASS: " text and some string of 4 digits and with whitespace " " between them.
But aware, it's very unsafe, because Regex patterns is very sensitive.
For example,
"-loaddd1 AbCdEfG..." (extra chars)
"-load1 AbCdEfG..." (multiple whitespaces)
"KEY PASS: 12345" (pattern in example below looks strictly only for 4 digits, not 5 or more or less)
"-LOAD1 AbCdEfG..." (uppercased)
etc.
This ones will be ignored (last, btw, could be solved by passing RegexOptions.IgnoreCase into Regex.Match(line, pattern, RegexOptions.IgnoreCase)). Others could be solved too, but you should know that this cases are possible.
For a provided in question example this code works fine:
string loadPattern = " [A-Za-z0-9]*\" ";
string keyPassPattern = #"KEY PASS: (\d{4})";
List<string> capturedValues = new List<string>();
foreach (string line in File.ReadAllLines("Preload.txt"))
{
string s;
if (Regex.IsMatch(line, loadPattern) && line.Contains("-load"))
{
// Getting captured substring and trimming from trailing whitespace and quote
s = Regex.Match(line, loadPattern, RegexOptions.IgnoreCase).Value.Trim('\"', ' ');
capturedValues.Add(s);
}
else if (Regex.IsMatch(line, keyPassPattern))
{
// Just replacing "KEY PASS: " to empty string
s = Regex.Match(line, keyPassPattern).Value.Replace("KEY PASS: ", "");
capturedValues.Add(s);
}
}
Result:

string s1 = "-load1 UvjkiJyjLlPN1o7FCAwQ0en80t769u5uBKAL1t0u0Cajk86WNmp83F";
String filter = s1.ToString();
String[] filterRemove = filter.Split(' ');
String Value1= filterRemove[1];
In this way, you will get
"UvjkiJyjLlPN1o7FCAwQ0en80t769u5uBKAL1t0u0Cajk86WNmp83F" in value1
in the same way you can do for all the string and combine them.

Find and replace the string in paragraph

I want to empty the value between the hyphn for example need to clear the data in between the range of hyphen prefix and suffix then make it has empty string.
string templateContent = "Template content -macro- -UnitDetails- -testEmail- sending Successfully";
Output
templateContent = "Template content sending Successfully";

templateContent = Regex.Replace(templateContent, #"-\w*-\s?", string.Empty).TrimEnd(' ');
#"-\w*-\s" - is regex pattern for '-Word- '
- - pattern for -
\w - word character.
* - zero or any occurrences of \w
\s - pattern for whitespace character
? - marks \s as optional
TrimEnd(' ') - to remove trailing space if there was a pattern at end of the string

There are many ways to do this, however given your example the following should work
var split = templateContent
.Split(' ')
.Where(x => !x.StartsWith("-") && !x.EndsWith("-"));
var result = string.Join(" ",split);
Console.WriteLine(result);
Output
Template content sending Successfully
Full Demo Here
Note : I personally think regex is better suited to this

You can use regex for this
string regExp = "(-[a-zA-Z]*-)";
string tmp = Regex.Replace(templateContent , regExp, "");
string finalStr = Regex.Replace(tmp, " {2,}", " ");

var resultWithSpaces = Regex.Replace(templateContent, #"-\S+-", string.Empty);
This regular expression looks for two hyphens surrounding one or more characters that are not white space.
It will leave the spaces that were around the removed word. To get rid of those you can do another Regex to replace multiple spaces with a single space.
var result = Regex.Replace(resultWithSpaces, #"\s+", " ");

How do I replace all instances of any special characters between each occurrence of a set of delimiters in a string?

I'm attempting to replace all instances of any special characters between each occurrence of a set of delimiters in a string. I believe the solution will include some combination of a regular expression match to retrieve the text between each set of delimiters and a regular expression replace to replace each offending character within the match with a space. Here’s what I have so far:
string input = "***XX*123456789~N3*123 E. Fake St. Apt# 456~N4*Beverly Hills*CA*902122405~REF*EI*902122405~HL*1*1*50*0~SBR*P*18*******MA~NM1*IL*1*Tom*Thompson*T***MI*123456789A~N3*456 W. False Ave.*Apt. #6B~N4*Beverly Hills*CA*90210~DMG*";
string matchPattern = "(~N3\\*)(.*?)(~N4\\*)";
string replacePattern = "[^0-9a-zA-Z ]?";
var matches = Regex.Matches(input, matchPattern);
foreach (Match match in matches)
{
match.Value = "~N3*" + Regex.Replace(match.Value, replacePattern, " ") + "~N4*";
}
MessageBox.Show(input);
I would expect the message box to show the following:
"***XX*123456789~N3*123 E Fake St Apt 456~N4*Beverly Hills*CA*902122405~REF*EI*902122405~HL*1*1*50*0~SBR*P*18*******MA~NM1*IL*1*Tom*Thompson*T***MI*123456789A~N3*456 W False Ave *Apt 6B~N4*Beverly Hills*CA*90210~DMG*"
Obviously this isn’t working because I can’t assign to the matched value inside the loop, but I hope you can follow my thought process. It is important that any characters which are not between the delimiters remain unchanged. Any direction or advice would be helpful. Thank you so much!

Use a Regex.Replace with a match evaluator where you may call the second Regex.Replace:
string input = "***XX*123456789~N3*123 E. Fake St. Apt# 456~N4*Beverly Hills*CA*902122405~REF*EI*902122405~HL*1*1*50*0~SBR*P*18*******MA~NM1*IL*1*Tom*Thompson*T***MI*123456789A~N3*456 W. False Ave.*Apt. #6B~N4*Beverly Hills*CA*90210~DMG*";
string matchPattern = #"(~N3\*)(.*?)(~N4\*)";
string replacePattern = "[^0-9a-zA-Z ]";
string res = Regex.Replace(input, matchPattern, m =>
string.Format("{0}{1}{2}",
m.Groups[1].Value,
Regex.Replace(m.Groups[2].Value, replacePattern, " "), // Here, you modify just inside the 1st regex matches
m.Groups[3].Value));
Console.Write(res); // Just to print the demo result
// => ***XX*123456789~N3*123 E Fake St Apt 456~N4*Beverly Hills*CA*902122405~REF*EI*902122405~HL*1*1*50*0~SBR*P*18*******MA~NM1*IL*1*Tom*Thompson*T***MI*123456789A~N3*456 W False Ave Apt 6B~N4*Beverly Hills*CA*90210~DMG*
See the C# demo
Actually, since ~N3* and ~N4* are literal strings, you may use a single capturing group in the pattern and then add those delimiters as hard-coded in the match evaluator, but it is up to you to decide what suits you best.

Replace a part of string containing Password

Slightly similar to this question, I want to replace argv contents:
string argv = "-help=none\n-URL=(default)\n-password=look\n-uname=Khanna\n-p=100";
to this:
"-help=none\n-URL=(default)\n-password=********\n-uname=Khanna\n-p=100"
I have tried very basic string find and search operations (using IndexOf, SubString etc.). I am looking for more elegant solution so as to replace this part of string:
-password=AnyPassword
to:
-password=*******
And keep other part of string intact. I am looking if String.Replace or Regex replace may help.
What I've tried (not much of error-checks):
var pwd_index = argv.IndexOf("--password=");
string converted;
if (pwd_index >= 0)
{
var leftPart = argv.Substring(0, pwd_index);
var pwdStr = argv.Substring(pwd_index);
var rightPart = pwdStr.Substring(pwdStr.IndexOf("\n") + 1);
converted = leftPart + "--password=********\n" + rightPart;
}
else
converted = argv;
Console.WriteLine(converted);

Solution
Similar to Rubens Farias' solution but a little bit more elegant:
string argv = "-help=none\n-URL=(default)\n-password=\n-uname=Khanna\n-p=100";
string result = Regex.Replace(argv, #"(password=)[^\n]*", "$1********");
It matches password= literally, stores it in capture group $1 and the keeps matching until a \n is reached.
This yields a constant number of *'s, though. But telling how much characters a password has, might already convey too much information to hackers, anyway.
Working example: https://dotnetfiddle.net/xOFCyG
Regular expression breakdown
( // Store the following match in capture group $1.
password= // Match "password=" literally.
)
[ // Match one from a set of characters.
^ // Negate a set of characters (i.e., match anything not
// contained in the following set).
\n // The character set: consists only of the new line character.
]
* // Match the previously matched character 0 to n times.

This code replaces the password value by several "*" characters:
string argv = "-help=none\n-URL=(default)\n-password=look\n-uname=Khanna\n-p=100";
string result = Regex.Replace(argv, #"(password=)([\s\S]*?\n)",
match => match.Groups[1].Value + new String('*', match.Groups[2].Value.Length - 1) + "\n");
You can also remove the new String() part and replace it by a string constant

REGEX Adding a string before comma c#

How can I append a known string before each coma on a comma separated string.
Is there a regex for that or something that doesn't use a loop
EX
given string :
email, email2, email3 (etc...)
to
string suffix = "#iou.com"
string desiredResult = "email#iou.com, email2#iou.com, email3#iou.com
Thank you!!

You can use [^,\s]+ regexp, and replace with "$0"+suffix:
var res = Regex.Replace(original, #"[^,\s]+", "$0"+suffix);
"$0" refers to the content captured by the regular expression.
Demo.

Or using LINQ:
Console.WriteLine(string.Join(",",input.Split(',').Select(s => string.Concat(s, suffix))));

You could use a zero-length capture group. Here's how that might look:
\w+(?<ReplaceMe>),?
The \w matches alphanumeric characters, and the named capture group called "ReplaceMe" matches the zero-length space between the end of the word and the beginning of the comma (or any other non-alphanumeric item, including the end of the string).
Then you'd just replace ReplaceMe with the appended value, like this:
Regex.Replace(original, #"\w+(?<ReplaceMe>),?", "#email.com");
Here's an example ofthat regex in action.

Here you are:
string input = "email, email2, email3";
string suffix = "#iou.com";
//string desiredResult = "email#iou.com, email2#iou.com, email3#iou.com";
Console.WriteLine(Regex.Replace((input + ",")
.Replace(",", suffix + ","), #",$", ""));
Hope this helps.