What does Regex help in defining?

The correct choice is related to the ability of Regex (Regular Expressions) to define and identify particular search patterns in text. Regular Expressions are powerful sequences of characters that create search patterns, primarily used for string matching and manipulation tasks. They allow users to specify complex search criteria, making it easy to find, extract, replace, or validate text based on specific patterns.

For example, Regex can be employed to validate email formats, search for specific sequences of characters within strings, or extract data that matches a particular format, such as phone numbers or dates. This versatility is crucial in programming, data processing, and text analysis.

In contrast, the areas related to financial transactions, network configurations, and user authentication processes primarily involve different methodologies and tools that do not leverage the pattern-matching capabilities of Regex in the same manner. They are more focused on transaction handling, network protocols, and security mechanisms, respectively.