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Find a word between 2 words and replace them [closed]

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How to find between 2 words and replace them into new string?
I wanna replace same.
for example given string :
string s = "word1-word2same-word3-word4";
same is = "word2";
What i wanna :
string s = "word1-word2word2-word3-word4";
But what if given string is:
string s = "word1same-word2-word3-word4";
same is -> word1;
What i wanna in this example:
string s = "word1word1-word2-word3-word4";
How to find what word is containing same? How to do it?

I think the following regular expression replacement is what you want
var input = "word1same-word2same-word3";
var result = Regex.Replace(input, "(?<=^|-)([^-]*)same", "$1$1");
Console.WriteLine(result);
would give you
word1word1-word2word2-word3
So it will replace all the instances of "same" with whatever comes before it up to a hyphen or the beginning of the string.
Note that something like "whatsamesamesame" will give you a result of "whatsamesamewhatsamesame", basically it will only replace the last "same" after a hyphen or the beginning of the string.

How to pass array of delimiters to Regex.Split function? [closed]

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As the title indicates, how can I pass an array of delimiters to a Regex.Split function? I'm needing to split a sentence (string) by a list of words (also strings).

You can build a regex pattern from "delimiter" words like this:
var delim = new string[] {"fox", "lazy"};
var pattern = #"(?:\s|^)(?:" + string.Join("|", delim.Select(Regex.Escape)) + #")(?:\s|$)";
\s and string anchors at the beginning and at the end ensure that delimiters include all white space around them, and that you avoid the Scunthorpe problem. Using Regex.Espace ensures that delimiters with regex meta-characters do not break your code.
The resultant pattern looks as follows:
(?:\s|^)(?:fox|lazy)(?:\s|$)
Demo 1
If you would like to keep delimiter words among the tokens, change regex to use them in a lookahead/lookbehind:
var delimGroup = "(?:"+string.Join("|", delim.Select(Regex.Escape))+")";
var pattern = #"\s(?="+delimGroup+")|(?<="+delimGroup+#")\s";
Demo 2

How to search and replace this line in the text. c# regex [closed]

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How to found and replace what is in a quotes in the string?
String for search and replace is
#define IP "127.0.0.1"
First I read all text from the file
string text = File.ReadAllText(path);
Than how to replace the what is in a quotes in the string?
Thanks.

Try using Regex.Replace. Example:
var input = "#define IP \"127.0.0.1\"";
var replacement = "4.4.4.4";
Regex rgx = new Regex(#"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}");
string result = rgx.Replace(input, replacement);
// result: #define IP "4.4.4.4"
The regular expression \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3} will match any IP. I've created an example on dotnetfiddle for you to see it matching 3 different IP Addresses.

regex to concatenate two strings in C# [closed]

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Is it possible to concatenate two sub strings from a input string using Regex
Example : Input string "ABTTPQR 00100300250000" and I want take first two characters "AB" and first 9 digits "001003002" and concatenate these two string to one "AB001003002"

Much shorter variation using references:
Regex.Replace("ABTTPQR 00100300250000", #"^(\w{2})\w*\s(\d{9})\d+$", #"$1$2")
// = "AB001003002"

You can do as follows :
Regex regex = new Regex(#"(\w{2})\w*\s(\d{9})\d*");
var matches = regex.Matches("ABTTPQR 00100300250000");
String output = matches[0].Groups[1].Value + matches[0].Groups[2].Value;
//AB001003002
Regex Explanation:
(\w{2})\w*\s(\d{9})\d*
The (\w{2}) will match the first 2 chars, then it will look for more chars and a space \w*\s then it will match first 9 digits (\d{9}) and then will look for more digits \d*.
The () captures the matches into groups which are accessed in c# like shown in code sample: matches[0].Groups[1].Value for group 1 (chars) and matches[0].Groups[2].Value for group 2 (digits)

C# Regex to split string by commas that are only before "or" [closed]

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I would like to split the following string based on the commas that come before the "or" delimiter and on the "or", but not after. For example
Almondmilk, Coconutmilk or Soymilk Select Varieties, Half Gallon
becomes
Almondmilk
Coconutmilk
Soymilk Select Varieties, Half Gallon

Given your requirement as described:
var output = Regex.Split(input, "(?<!or.*),");
However, given your sample output it seems you want to split on 'or' as well:
var output = Regex.Split(input,
"((?<!or.*),)|(or)",
RegexOptions.ExplicitCapture);