![]() ![]() ^ and $ indicate the start and end of the string respectively.* is a repetition operator which indicates zero or more copies of the query string, parameters, or subdirectories.\b represents the boundary of a word, i.e.This represents the set of characters to allow in the top-level domain part. means any lowercase letters from a to z with a length between two and six. ![]() While the second instance of this set represents the set of characters to allow in the query string or subdirectory part. The first instance of this set represents the set of characters to allow in the sub-domain and root domain parts.
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