題目:
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.
For example, assume that file.txt
has
the following content:
987-123-4567 123 456 7890 (123) 456-7890Your script should output the following valid phone numbers:
987-123-4567 (123) 456-7890
1
2
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# Read from the file file.txt and output all valid phone numbers to stdout. grep '[(0-9][0-9][0-9)][- ][0-9][0-9][0-9]-[0-9][0-9][0-9][0-9]' file.txt |
1
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grep '^(\{0,1\}[0-9]\{3\}\{0,1\}[-
][0-9]\{3\}-[0-9]\{4\}$' file.txt |
1
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grep "^(\{0,1\}[0-9]\{3\}\(-\|) \)[0-9]\{3\}-[0-9]\{4\}$" file.txt |
1
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grep "\(^([0-9]\{3\}) \|^[0-9]\{3\}-\)[0-9]\{3\}-[0-9]\{4\}$" file.txt |