Leetcode 193. Valid Phone Numbers
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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:
987-123-4567123 456 7890(123) 456-7890Your script should output the following valid phone numbers:
987-123-4567(123) 456-7890思路:使用的正则表达式匹配xxx-xxx-xxxx或者(xxx) xxx-xxxx两种情况
参考代码:
awk '$0 ~ /^((([0-9]{3}-)|(\([0-9]{3}\) ))[0-9]{3}-[0-9]{4})$/ {print $0}' file.txt 0 0
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