C# replace with regular expression

Question

This code doesn't work, but it works with other expressions, like (?:[A-Za-z][A-Za-z0-9_]*).

The below expression works correctley in a regular expression tester, but it doesn't replace Hello with id in this code:

string test = "int Hello :=   2 ;";
string pattern = "\b(?!int|bool)(?:[A-Za-z][A-Za-z0-9_]*)\b";
string replacement = "Id";
Regex rgx = new Regex(pattern);
string newline = rgx.Replace(test, replacement);

Selman Genç · Accepted Answer · 2014-02-26 17:30:30Z

4

You should escape backslashes or use @ beginning of your string and make it verbatim string. \b has a special meaning in C# which is backspace, see documentation: Escape Sequences

string pattern = @"\b(?!int|bool)(?:[A-Za-z][A-Za-z0-9_]*)\b";

edited Feb 26, 2014 at 17:30

answered Feb 26, 2014 at 17:23

Selman Genç

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