CODEWITHSUNDEEP
c#regex
user2406618
user2406618

Reputation: 144

Regex replace the value of a particular pattern (escape double quotes)

I have a bring string of say 2000 characters. I want to search for particular pattern and then replace the part of that pattern.

the string is as follows:

data = "additional data \"StartDate\":\"20141101\" additonal data  additional data"

Is there a way to change the value 20141101 with some other value say 20121212 that is near to startdate. I am facing issues with double quotes that are near to the search pattern.

Upvotes: 0

Views: 82

Answers (2)

xanatos
xanatos

Reputation: 111940

Some possible solutions:

string data = "additional data \"StartDate\":\"20141101\" additonal data  additional data";

The one I would use: it uses zero-width assertions to "match" the "StartDate":" and the final ":

string data2 = Regex.Replace(data, "(?<=\"StartDate\":\")([0-9]{8})(?=\")", "xxxxxxxx");

The "simple" solution: it matches \"StartDate\":\"20141101\" and replaces with \"StartDate\":\"xxxxxxxx\"

string data3 = Regex.Replace(data, "\"StartDate\":\"[0-9]{8}\"", "\"StartDate\":\"xxxxxxxx\"");

Another solution, based on using the special replacers $1, $3, that are the strings captured in the first and third capture group (the (...))

string data4 = Regex.Replace(data, "(\"StartDate\":\")([0-9]{8})(\")", "$1xxxxxxxx$3");

Upvotes: 1

0x3h
0x3h

Reputation: 462

if the value is always numeric:

var data = "additional data \"StartDate\":\"20141101\" additonal data  additional data";
var num = new Regex("StartDate.+?(\\d+)").Match(data).Groups[1].Value;
Console.WriteLine(data.Replace(num, "20121212"));

Upvotes: 0

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