c# - How to replace a user input in regular expression? -


i use simple codes describe situation. example, here codes:

using system; using system.text.regularexpressions;  public class example {    public static void main()    {       string pattern = @"\b(?!non)\w+\b";       string input = "nonsense not non-functional.";       foreach (match match in regex.matches(input, pattern, regexoptions.ignorecase))          console.writeline(match.value);    } }

now, replace "non" user input. let it's called "userinput" , codes written getting user input. want this, error exists:

string pattern = @"\b(?!{0})\w+\b", userinput;

is there way replace "non" inside pattern of regex user input?

i think you're missing string.format():

string pattern = string.format(@"\b(?!{0})\w+\b", userinput);

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