【一练】（正则表达式）从文本中获取不同格式电话号码
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下一篇 2017-10-24 15:00:49
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#cat telnum.txt
800-555-1212
800-555-121-1213
800 555 1212
800.55.1212
(800)555-1212
1-800-555-1212
800-555-1212-1234
800-555-1212x1234
800-555-1212ext.1234
work 1-(800)555.1212#1234
qwertyui12
qwert 90e
#grep -E "[[:digit:]]{3}[^[:digit:]]*[[:digit:]]{3}[^[:digit:]]*[[:digit:]]{4}[^[:digit:]]*[[:digit:]]*$" telnum.txt
800-555-1212
800-555-121-1213
800 555 1212
800.55.1212
(800)555-1212
1-800-555-1212
800-555-1212-1234
800-555-1212x1234
800-555-1212ext.1234
work 1-(800)555.1212#1234
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