What is the reason for the "method or data member not found" compile error that occurs while attempting to execute RegEx code?

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The "method or data member not found" compile error can occur while attempting to execute RegEx code if the Regular Expressions library or module has not been properly referenced in the code or if the method or data member being called does not exist. This error can also occur if the syntax of the RegEx code is incorrect, causing the code to fail to compile.