c# - replace variable name in formula with Regex.Replace -

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in c#, want use regular expression replace each variable @a number withouth replacing other similar variables @ab

string input = "3*@a+3*@ab/@a"; string value = "5"; string pattern = "@a"; //<- doesn't work string result = regex.replace(input, pattern, value); // espected result = "3*5+3*@ab/5"

any idea?

use word boundary \b:

string pattern = @"@a\b";

see regex demo (context tab)

note @ before string literal: using verbatim string literal declare regex pattern not have escape \. otherwise, string pattern = "@a\\b";.


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