如何用sed进行匹配和部分替换

Question

如何匹配子字符串“2153846-11”（有时仅由数字组成，如“2153846”，有时如“2153846-11”或“2153846_11”，有时如“2153846-1” " 总是数字并且在第一组中不少于 5) 在以下内容中：

"01/16/2015","2153846-11","2015-01-16 02:50:18.0","lch_demo_hidemi-19459072-2","","01/16/2015"

并用第一组（在 dash/underscore 之前）替换匹配的字符串，删除第二组。

最终结果将是：

"01/16/2015","2153846","2015-01-16 02:50:18.0","lch_demo_hidemi-19459072-2","","01/16/2015"

该指令将被写入一个独特的 sed 行，如

sed -e 's/...//g' < myfile

谢谢

Answer 1

您可以使用这个 sed：

sed 's/"\([0-9]*\)[_-][0-9]*"/""/g' file
"01/16/2015","2153846","2015-01-16 02:50:18.0","lch_demo_hidemi-19459072-2","","01/16/2015"

Answer 2

您可以试试下面的 sed 命令。

$ echo '"01/16/2015","2153846-11","2015-01-16 02:50:18.0","lch_demo_hidemi-19459072-2","","01/16/2015"' | sed -r 's/"(2153846)([_-]11)?"/""/g'
"01/16/2015","2153846","2015-01-16 02:50:18.0","lch_demo_hidemi-19459072-2","","01/16/2015"

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