Exam CIS-SM topic 1 question 26 discussion

The correct answer is: A Explanation: [\w\d\-\.] matches any word character, digit, hyphen, or period. The + after the character class indicates that the character in the list can appear one or more times. So, the regular expression ([\w\d\-\.]+) will match one or more occurrences of word characters, digits, hyphens, or periods.

[\w\d\-\.] is a character class that matches any single character that is either a word character (\w), a digit (\d), a hyphen (\-), or a period (\.). \w: Matches any word character, which includes letters, digits, and underscores. \d: Matches any digit. \-: Matches a hyphen character. The hyphen is escaped with a backslash because it is a special character in regular expressions. \.: Matches a period character. The period is also escaped with a backslash. + is a quantifier that indicates the preceding character class ([\w\d\-\.]) should appear one or more times. In other words, it matches one or more of the specified characters.

A is correct answer

The + lets it match one or more. Try it out on regex101.com