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Are you performing the replacement in C#, or in Visual Studio (or another IDE or text editor)? If Visual Studio, what version are you using?
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Are you performing the replacement in C#, or in Visual Studio (or another IDE or text editor)? If Visual Studio, what version are you using?

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Then what was proposed above should be fine. Earlier versions of VS had their own unique regex syntax for Find/Replace. VS 2012 and VS 2013 both use PCRE.
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Then what was proposed above should be fine. Earlier versions of VS had their own unique regex syntax for Find/Replace. VS 2012 and VS 2013 both use PCRE.

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Is it possible to create a Regex pattern that match under the following situation?<br />
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String to Search = T.TestString<br />
Possible Matching Search Input Strings = T.TestString, TestString<br />
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However I only want the T.TestString to match so I can replace the string. &nbsp;Otherwise the replacement would be incorrect.
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Is it possible to create a Regex pattern that match under the following situation?

String to Search = T.TestString
Possible Matching Search Input Strings = T.TestString, TestString

However I only want the T.TestString to match so I can replace the string.  Otherwise the replacement would be incorrect.

Regex Pattern Question

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).

A regular expression ("regex") is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK. Many programming languages provide regular expression capabilities, some built-in, for example Perl, JavaScript, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11). Most other languages offer regular expressions via a library.