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replacing data in between specific characters

I have a string which has some keys between <<>>.
string s = "<p>Hi <<USER>>,<br/>How are you doing<br/>Regards,<br/><<SENDER>></p>";
I want to first fetch the key names USER and SENDER in a list which i did by:
var keys = new List<string>();
foreach (Match match in Regex.Matches(s, #"<<(.*?)>>"))
{
keys.Add(match.Groups[1].Value);
}
List<string> values= new List<string>(){"John","Team"};
After we get the keys,i want to replace these keys by another list(named values here) which has the values for these keys and want the result as:
string s = "<p>Hi John,<br/>How are you doing<br/>Regards,<br/>Team</p>";
The string s can be anything and the no of keys and their values could also vary but the keys will always be enclosed in between <<>>

As suggested by #AlexBell, you could simply use the String.Replace() method.
Further, it's more convenient to declare a collection of placeholder/value pairs, like so:
string s = "<p>Hi <<USER>>,<br/>How are you doing<br/>Regards,<br/><<SENDER>></p>";
Dictionary<string, string> dictionary = new Dictionary<string, string>();
dictionary.Add("<<USER>>", "Jhon");
dictionary.Add("<<SENDER>>", "Team");
StringBuilder text = new StringBuilder(s);
foreach (var entry in dictionary)
{
text.Replace(entry.Key, entry.Value);
}
Console.WriteLine(text.ToString());

This function will perform the replacements that you ask for, using Regex.Replace:
public static string ParseTemplate(string template, string username, string senderName)
{
template = Regex.Replace(template, #"<<USER>>", username);
return Regex.Replace(template, #"<<SENDER>>", senderName);
}
Example:
string s = "<p>Hi <<USER>>,<br/>How are you doing<br/>Regards,<br/><<SENDER>></p>";
ParseTemplate(s, "John", "Team").Dump();
Output:
<p>Hi John,<br/>How are you doing<br/>Regards,<br/>Team</p>
You can call this in a loop over your dictionary or list of names.

Your business logic is a bit unclear, so based on just qualified guess, you can apply standard .NET/C# String.Replace Method (String, String)
(re:https://msdn.microsoft.com/en-us/library/fk49wtc1%28v=vs.110%29.aspx), for example:
string s = "<p>Hi <<USER>>,<br/>How are you doing<br/>Regards,<br/><<SENDER>></p>".Replace("<USER>", "John").Replace("<SENDER>", "Team");
Hope this may help.

//First we have lists of values (users) and senders
List<string> values= new List<string>(){"John","Team"};
List<string> senders = new List<string>(){"John","Team"};
//Then we can join that list using string.join
var allUsers = string.Join(",", values);
var allSender = string.Join(",", senders);
//Next we will be replacing it in our string
var namedString = Regex.Replace(string, #"<<USER>>", allUsers);
var output = Regex.Replace(namedString , #"<<SENDER>>", allSender);

RegEx not being able to match data

i am using RegEx to find and replace data.
suppose my code is
Dictionary<string, string> data=new Dictionary<string, string>();
data.Add("JID","421587");
string template ="Your unique job number is {JID} .Your part will be collected by us"
string result = Regex.Replace(template, #"{([^{}]+)}", delegate(Match match)
{
string key = match.Groups[1].Value;
return data[key];
});
_body = result;
return this;
actually i am trying to find out this character {JID} and want to replace {JID} with the value which is store in dictionary but i guess the patter i used here #"{([^{}]+)} is not right to find out the data and replace it with {JID} .
so please help me to how to find {JID} from string and replace. thanks
EDIT
actually the text i was trying to replace that was huge html text and may that is why problem occur.
so now i manage the whole thing this way.
public MailTemplate ParseTemplate(Dictionary<string, string> data)
{
string template = GetBody();
foreach(KeyValuePair<string, string> item in data)
{
if (item.Key.ToUpper() != "ATTACHEDFILEPATH")
{
template = template.Replace("{" + item.Key + "}", item.Value);
}
}
_body = template;
return this;
}

Replace {x} tokens in strings

We have a template URL like:
http://api.example.com/sale?auth_user=xxxxx&auth_pass=xxxxx&networkid={networkid}&category=b2c&country=IT&pageid={pageid}&programid=133&saleid=1&m={master}&optinfo={optinfo}&publisher={publisher}&msisdn={userId}
and I have values for these constant tokens. How can replace all these tokens in C#?

A simple approach is to use a foreach and a Dictionary with a String.Replace:
var values = new Dictionary<string, string> {
{ "{networkid}", "WHEEE!!" }
// etc.
};
var url = "http://api.example.com/sale?auth_user=xxxxx&auth_pass=xxxxx&networkid={networkid}&category=b2c&country=IT&pageid={pageid}&programid=133&saleid=1&m={master}&optinfo={optinfo}&publisher={publisher}&msisdn={userId}";
foreach(var key in values.Keys){
url = url.Replace(key,values[key]);
}

There is no standard way to "replace with dictionary values" in .NET. While there are a number of template engines, it's not very hard to write a small solution for such an operation. Here is an example which runs in LINQPad and utilizes a Regular Expression with a Match Evaluator.
As the result is a URL,
it is the callers responsibility to make sure all the supplied values are correctly encoded. I recommend using Uri.EscapeDataString as appropriate .. but make sure to not double-encode, if it is processed elsewhere.
Additionally, the rules of what to do when no replacement is found should be tailored to need. If not-found replacements should be eliminated entirely along with the query string key, the following can expand the regular expression to #"\w+=({\w+})" to also capture the parameter key in this specific template situation.
string ReplaceUsingDictionary (string src, IDictionary<string, object> replacements) {
return Regex.Replace(src, #"{(\w+)}", (m) => {
object replacement;
var key = m.Groups[1].Value;
if (replacements.TryGetValue(key, out replacement)) {
return Convert.ToString(replacement);
} else {
return m.Groups[0].Value;
}
});
}
void Main()
{
var replacements = new Dictionary<string, object> {
{ "networkid", "WHEEE!!" }
// etc.
};
var src = "http://api.example.com/sale?auth_user=xxxxx&auth_pass=xxxxx&networkid={networkid}&category=b2c&country=IT&pageid={pageid}&programid=133&saleid=1&m={master}&optinfo={optinfo}&publisher={publisher}&msisdn={userId}";
var res = ReplaceUsingDictionary(src, replacements);
// -> "http://api.example.com/sale?..&networkid=WHEEE!!&..&pageid={pageid}&..
res.Dump();
}
More advanced techniques, like reflection and transforms, are possible - but those should be left for the real template engines.

I am guessing you are trying to replace parameters in url with your values. This can be done using C# HttpUtility.ParseQueryString
Get the CurrentURL from
var _myUrl = System.Web.HttpUtility.ParseQueryString(Request.RawUrl);
Read Parameter from your Query string
string value1 = _myUrl ["networkid"];
Write a value into the QueryString object.
_myUrl ["networkid"] = "Your Value";
and then finally turn it back into URL
var _yourURIBuilder= new UriBuilder(_myUrl );
_myUrl = _yourURIBuilder.ToString();

You can use this alos using LinQ
Dictionary<string, string> myVal = new Dictionary<string, string>();
myVal.Add("networkid", "1");
myVal.Add("pageid", "2");
myVal.Add("master", "3");
myVal.Add("optinfo", "4");
myVal.Add("publisher", "5");
myVal.Add("userId", "6");
string url = #"http://api.example.com/sale?auth_user=xxxxx&auth_pass=xxxxx&networkid={networkid}&category=b2c&country=IT&pageid={pageid}&programid=133&saleid=1&m={master}&optinfo={optinfo}&publisher={publisher}&msisdn={userId}";
myVal.Select(a => url = url.Replace(string.Concat("{", a.Key, "}"), a.Value)).ToList();
this line can do your required functionlity
myVal.Select(a => url = url.Replace(string.Concat("{", a.Key, "}"), a.Value)).ToList();

There is a Nuget called StringTokenFormatter that does this well
https://www.nuget.org/packages/StringTokenFormatter/

Regex.Replace makes a single pass over a template string, offering you an opportunity to replace matched expressions. Use it by creating an regular expression that matches any token. Then look up replacement values for the tokens in a dictionary.
static string ReplaceTokens(string template, Dictionary<string, string> replacements) =>
Regex.Replace(template, #"{(\w+)}",
match => replacements.TryGetValue(match.Groups[1].Value, out string replacement) ? replacement : match.Value);
The algorithm completes in time linear with the size of the template string and the replacement strings, so O(t + r). Beware of algorithms that make multiple passes. They run slowly in time O(t * r) and will give incorrect results if one of the replacement values contains a token for later replacement. This unit test shows the pitfall:
public void TestReplaceTokens() {
var replacements = new Dictionary<string, string> {
["Movement"] = "drive {DontReplace}",
["DontReplace"] = "Should not appear"
};
string withReplacements = ReplaceTokens("I always {Movement} in {Direction}.", replacements);
Assert.AreEqual("I always drive {DontReplace} in {Direction}.", withReplacements);
}

c# - regex to find a string that comes after = [duplicate]

This question already has answers here:
regex to find a string that comes after =
(6 answers)
Closed 9 years ago.
So I asked this question before and said I wanted it in javascript but realized later on that it's unecessary data being sent. So it would be great if anybody could help me solve the same thing in C#
What I need is to get several properties out of a string.
The string will look something like:
str = "car[brand=saab][wheels=4]";
There can be more or fewer properties.
I need everything before the first [] in 1 variable.
Then I need each property and its value in a variable.
Easiest way to understand what I want is probably to check my previous question and the answer that solved it :)

I used the regex(slightly different) in your previous question.
string input = "car[brand=saab][wheels=4]";
string product = "";
Dictionary<string, string> props = new Dictionary<string, string>();
foreach (Match m in Regex.Matches(input, #"^(\w+)|\[(\w+)=(.+?)\]"))
{
if (String.IsNullOrEmpty(product))
product = m.Groups[1].Value;
else
props.Add(m.Groups[2].Value, m.Groups[3].Value);
}

try this regex:
(.+?)(\[.+?\])+
and a sample code:
var inputString = "car[brand=saab][wheels=4]";
var pattern = #"(?<v1>.+?)(?<v2>\[.+?\])+";
var v1 = Regex.Match(inputString, pattern).Groups["v1"].Value;
Dictionary<String, String> list = new Dictionary<String, String>();
foreach (Capture capture in Regex.Match(inputString, pattern).Groups["v2"].Captures)
{
var sp = capture.Value.Split('=');
list.Add(sp[0], sp[1]);
}
explain:
(?<name>subexpression)
Captures the matched subexpression into a named group.

You can do this
var lst=Regex.Matches(input,#"(\w+)((?:\[.*?\])+)")
.Cast<Match>()
.Select(x=>new
{
name=x.Groups[1].Value,
value=Regex.Matches(x.Groups[2].Value,#"(?<=\[).*?(?=\])")
.Cast<Match>()
.Select(x=>new
{
name=x.Groups[0].Value.Split('=')[0],
value=x.Groups[0].Value.Split('=')[1]
})
});
Now you can iterate over lst like this
foreach(var parent in lst)
{
parent.name;//car
foreach(var pairs in parent.value)
{
pairs.name;//brand,wheels
pairs.value;//ferrari,4
}
}
So,for input car[brand=a][wheels=4]cycle[brand=b][wheels=2]
Output would be like
car
brand,a
wheels,4
cycle
brand,b
wheels,2

Without regex:
string input = "car[brand=saab][wheels=4]";
var query = from s in input.Replace("]", "").Split('[')
let vars = s.Split('=')
let name = vars[0]
let value = vars.Length > 1 ? vars[1] : ""
select new {Name = name, Value = value};
string firstVar = query.First().Name;
Dictionary<string, string> otherVars = query
.Skip(1)
.ToDictionary(v => v.Name, v => v.Value);
You can access your variables in the dictionary like this string brand = otherVars["brand"]

Since you already have an answer using regex and your comments state it doesn't have to be with a regex, I'll offer an alternative:
The code is
string str = ("car[brand=saab][wheels=4]");
int i = str.IndexOf("[");
string[] details =str.Substring(i).Replace("]","").Split('[');
string name = str.Substring(0, i);
string brand = details[1].Split('=')[1];
string wheels = details[2].Split('=')[1];
This approach assumes the data is always going to be in the same format though; you may need some validation in there depending on your needs...

How can you change a ";" seperated string to some kind of dictionary?

I have a string like this:
"user=u123;name=Test;lastname=User"
I want to get a dictionary for this string like this:
user "u123"
name "Test"
lastname "User"
this way I can easely access the data within the string.
I want to do this in C#.
EDIT:
This is what I have so far:
public static Dictionary<string, string> ValueToDictionary(string value)
{
Dictionary<string, string> result = null;
result = new Dictionary<string, string>();
string[] values = value.Split(';');
foreach (string val in values)
{
string[] valueParts = val.Split('=');
result.Add(valueParts[0], valueParts[1]);
}
return result;
}
But to be honest I really think there is a better way to do this.
Cheers,
M.

You can use LINQ:
var text = "user=u123;name=Test;lastname=User";
var dictionary = (from t in text.Split( ";".ToCharArray() )
let pair = t.Split( "=".ToCharArray(), 2 )
select pair).ToDictionary( p => p[0], p => p[1] );

Split the string by ";".
Iterate over every element in the resulting array and split every element by "=".
Now;
dictionary.add(element[0], element[1]);
I Hope I made it clear enough.

Dictionary<string, string> d = new Dictionary<string, string>();
string s1 = "user=u123;name=Test;lastname=User";
foreach (string s2 in s1.Split(';'))
{
string[] split = s2.Split('=');
d.Add(split[0], split[1]);
}

var dictionary = new Dictionary<string, string>();
var linedValue = "user=u123;name=Test;lastname=User";
var kvps = linedValue.Split(new[] { ';' }); // you may use StringSplitOptions.RemoveEmptyEntries
foreach (var kvp in kvps)
{
var kvpSplit = kvp.Split(new[] { '=' });
var key = kvpSplit.ElementAtOrDefault(0);
var value = kvpSplit.ElementAtOrDefault(1);
dictionary.Add(key, value);
// you may check with .ContainsKey if key is already persistant
// you may check if key and value with string.IsNullOrEmpty
}

If you know for sure that there are no separator chars in your input data, the following works
string input = "user=u123;name=Test;lastname=User";
string[] fragments = input.Split(";=".ToArray());
Dictionary<string,string> result = new Dictionary<string,string>()
for(int i=0; i<fragments.Length-1;i+=2)
result.Add(fragments[i],fragments[i+1]);
It might perform slightly better than some of the other solutions, since it only calls Split() once. Usually I would go for any of the other solutions here, especially if readability of the code is of any value to you.

I think I would do it like this...
String s = "user=u123;name=Test;lastname=User";
Dictionary<string,string> dict = s.ToDictionary();
The implementation of ToDictonary is the same as yours except that I would implement it as an extension method. It does look more natural.