How to replace substring in a string in c#

Question

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I want to replace the substrings 134 and 1254 in a string

((startTime==134)&&(endTime==1254))

with some dynamic value - say, for example, 154 and 1234 respectively. I have written the code to place using String.Split method but it seems the code is very long. How can I make it shorter and more robust?
In my requirement it is fetching ((startTime==134)&&(endTime==1254)) from xml file where the value of startTime and endTimekeeps on changing based on manipulation from below code

Here is the code:

C#

string s = "((startTime==134)&&(endTime==1254))";
string[] time = s.Split(')').Reverse().ToArray();
var start = time.FirstOrDefault(s => s.Contains("startTime")).Split('=')[2];
var end = time.FirstOrDefault(e => e.Contains("endTime")).Split('=')[2];
start ="154";
end = "1234"
time[3] = "((startTime=="+start;
time[2] = "&&(endTime=="+end;
string joinedstring;
joinedstring= String.Join(")", time.Reverse());

Posted 1-Mar-15 17:59pm

Member 11380284

Updated 1-Mar-15 19:00pm

v3

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[no name] 2-Mar-15 0:19am

Here ((startTime==134)&&(endTime==1254)),
only the integer values are going to change, rest all remains the same ?

Member 11380284 2-Mar-15 0:53am

Yes only integer values are going to change

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Praneet Nadkar · Accepted Answer · 2015-03-01T18:32:00

Hi,

Pleae try the following code:

C#

string joinedstring;
string split = "&&";
string time1 = "154";
string time2 = "1234";
string s = "((startTime==134)&&(endTime==1254))";
string[] lines = Regex.Split(s, split);
Console.WriteLine(s);
Console.WriteLine(Regex.Replace(lines[0], @"\d+", time1) + split + Regex.Replace(lines[1], @"\d+", time2));
Console.ReadKey();

I tried that using RegEx. It worked for me.

Hope this helps !! :) :)

Revert in case anything else is required.

Wendelius · Accepted Answer · 2015-03-01T18:06:00

Solution 1

If I understood your question correctly, just use String.Replace Method (String, String)[^]

Posted 1-Mar-15 18:06pm

Wendelius

Santosh K. Tripathi · Accepted Answer · 2015-03-01T18:59:00

Hi,

some time i faced some problem for replace in a string.

lets assume, i have string "1234gg1234567" and i want to replace "1234" from starting position only OR only from end.

how will i do?

try this code. modify according to you need. This is based on index of a character in a string.

C#

string str = "((startTime==134)&&(endTime==1254))";

int pos_start_1 = str.IndexOf("==") + 2;
int pos_end_1 = str.IndexOf(")&&(");
int pos_start_2 = str.LastIndexOf("==") + 2;
int pos_end_2 = str.IndexOf("))");

string time1 = str.Substring(pos_start_1, (pos_end_1 - pos_start_1));
string time2 = str.Substring(pos_start_2, (pos_end_2 - pos_start_2));

string time1_new = "time1_new";
string time2_new = "time1_new";

string newString = str.Replace(time1, time1_new).Replace(time2, time2_new);

How to replace substring in a string in c#

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