Which Regular Expression will parse the value 5.2.0 from the string "Version 5.2.0"?

Which Regular Expression will parse the value 5.2.0 from the string "Version 5.2.0"?

• A. Version (\.*)
• B. Version\s+(\d+\.\d+\.\d+)
• C. Version (\d+)
• D. Version (\d+).(\d+).(\d+)

Answer: (B)

The choice indicating "Version\s+(\d+\.\d+\.\d+)" is correct because it uses a regular expression pattern that effectively captures the version number formatted as "X.Y.Z," where X, Y, and Z are digits. Breaking this down, "Version" specifies that the string must start with the literal text "Version." The "s+" part matches one or more whitespace characters following "Version," which accommodates potential spacing in the input string. This is important because the whitespace can vary, and this part of the regex ensures that variations like "Version 5.2.0" (with multiple spaces) would still be matched. The main capturing group, "(\d+\.\d+\.\d+)," is set to match three numeric segments separated by dots (.). The "\d+" within each segment captures one or more digits, while the "\." ensures that the dots themselves are included as literals in the pattern rather than as wildcard characters. Because the version number in the string is indeed formatted this way—two digits followed by a dot, another digit, another dot, and another digit—this part of the regex is capable of matching exactly the structure of "5.2.0." In essence, this regex

The choice indicating "Version\s+(\d+.\d+.\d+)" is correct because it uses a regular expression pattern that effectively captures the version number formatted as "X.Y.Z," where X, Y, and Z are digits.

Breaking this down, "Version" specifies that the string must start with the literal text "Version." The "s+" part matches one or more whitespace characters following "Version," which accommodates potential spacing in the input string. This is important because the whitespace can vary, and this part of the regex ensures that variations like "Version 5.2.0" (with multiple spaces) would still be matched.

The main capturing group, "(\d+.\d+.\d+)," is set to match three numeric segments separated by dots (.). The "\d+" within each segment captures one or more digits, while the "." ensures that the dots themselves are included as literals in the pattern rather than as wildcard characters. Because the version number in the string is indeed formatted this way—two digits followed by a dot, another digit, another dot, and another digit—this part of the regex is capable of matching exactly the structure of "5.2.0."

In essence, this regex