Which regular expression would match the numerical string "123-422-17365"?

The correct choice is based on the pattern that matches the structure of the numerical string "123-422-17365". This string consists of two groups of three digits, each followed by a hyphen, and concludes with a group of five digits.

The regular expression provided in the correct choice captures this structure effectively. The first part, (\d{3}[\- ]){2}, indicates that there are two instances of a sequence containing three digits (\d{3}) followed by either a hyphen or a space ([\- ]). This accurately matches the first two segments of the given number, "123-" and "422-".

Following this, \d{5} specifies that there should be a single instance of exactly five digits, which matches the last part of the string, "17365". Therefore, the entire expression will match the string format of "123-422-17365" perfectly.

The other options do not align with the required structure. For instance, option B incorrectly attempts to match a specific five-digit sequence using \d{17365}, which is not a valid syntax for matching a specific number of digits. Meanwhile, options C and D suggest matching three groups of three digits or