regex - Fixed string Regular Expression C# -

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hi want know regarding fixed-string in regular expression. how represent fixed-string, regardless of special characters or alphanumeric in c#?

for eg; have @ following string:

infinity.world.uk/members/namelist.aspx?id=-1&fid=x

the entire string before x fixed-string (ie; whole sentence appear same) x decimal variable.

what want want append decimal number x fixed string. how express in terms of c# regular expression.

appreciate help

if need modify existing url, dont use regex, string.format or string.replace problem encoding of arguments

use uri , httputility instead:

var url = new uri("http://infinity.world.uk/members/namelist.aspx?id=-1&fid=x"); var query = httputility.parsequerystring(url.query);  query["fid"] = 10.tostring();  var newurl = url.getleftpart(uripartial.path) + "?" + query;

result: http://infinity.world.uk/members/namelist.aspx?id=-1&fid=10

for example, using query["fid"] = "%".tostring(); correctly generate http://infinity.world.uk/members/namelist.aspx?id=-1&fid=%25

demo: https://dotnetfiddle.net/zz9y1h


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