


How to Replace Whole Words in a String Using Regular Expressions in VB or C#?
Jan 05, 2025 am 01:01 AMRegex for Precise Word-Level String Replacement
The task involves replacing only whole words within a string, excluding partial matches. To achieve this, the question suggests utilizing either VB or C# code. While the context focuses on VB for SSRS 2008 code, a response in C# is also provided for reference.
Using Regular Expressions to Match Whole Words
The most straightforward approach is to employ regular expressions (regex) with the b metacharacter, which denotes word boundaries. This technique ensures that the replacement only occurs when a whole word matches the pattern.
C# Implementation
string input = "test, and test but not testing. But yes to test"; string pattern = @"\btest\b"; string replace = "text"; string result = Regex.Replace(input, pattern, replace); Console.WriteLine(result);
VB Implementation (SSRS 2008)
Dim input As String = "test, and test but not testing. But yes to test" Dim pattern As String = "\btest\b" Dim replace As String = "text" Dim result As String = Regex.Replace(input, pattern, replace) Console.WriteLine(result)
Case-Insensitive Matching
To perform a case-insensitive replacement, use the RegexOptions.IgnoreCase flag:
Regex.Replace(input, pattern, replace, RegexOptions.IgnoreCase);
Regex.Replace(input, pattern, replace, RegexOptions.IgnoreCase)
By employing regular expressions and matching word boundaries, you can effectively replace entire words within a string, preventing unintentional modifications involving partial matches.
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