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.
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Example:
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Assume that file.txt has the following content:
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987-123-4567
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123 456 7890
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(123) 456-7890
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Your script should output the following valid phone numbers:
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987-123-4567
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(123) 456-7890
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正则表达式:
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# Read from the file file.txt and output all valid phone numbers to stdout.
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cat file.txt | grep "^\(([0-9]\{3\}) \|^[0-9]\{3\}-\)[0-9]\{3\}-[0-9]\{4\}quot;
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