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193.Valid Phone Numbers

193.Valid Phone Numbers
难度:Easy
Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers.
You may assume that a valid phone number must appear in one of the following two formats: (xxx) xxx-xxxx or xxx-xxx-xxxx. (x means a digit)
You may also assume each line in the text file must not contain leading or trailing white spaces.
Example:
Assume that file.txt has the following content:
987-123-4567
123 456 7890
(123) 456-7890
Your script should output the following valid phone numbers:
987-123-4567
(123) 456-7890
正则表达式:
# Read from the file file.txt and output all valid phone numbers to stdout.
cat file.txt | grep "^\(([0-9]\{3\}) \|^[0-9]\{3\}-\)[0-9]\{3\}-[0-9]\{4\}$"
执行用时 :0 ms, 在所有 C++ 提交中击败了100.00%的用户 内存消耗 :3.1 MB, 在所有 C++ 提交中击败了52.82%的用户