You write the following method (line numbers are included for reference only):

You need to ensure that the method extracts a list of URLs that match the following pattern:
@http://(www\.)?([^\.]+)\.com;
Which code should you insert at line 07?

正解:A
Explanation/Reference:
Explanation:
The MatchCollection.GetEnumerator method returns an enumerator that iterates through a collection.
Note:
The MatchCollection Class represents the set of successful matches found by iteratively applying a regular expression pattern to the input string.
Reference: MatchCollection.GetEnumerator Method
https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.matchcollection.getenumerator (v=vs.110).aspx