[英]Why does this sed command to match number not work?
My command is like this: 我的命令是这样的:
echo "12 cats" | sed 's/[0-9]+/Number/g'
(I'm using the sed
in vanilla Mac) (我在香草Mac中使用
sed
)
I expect the result to be: 我希望结果如下:
Number cats
However, the real result is: 但是,真正的结果是:
12 cats
Does anyone have ideas about this? 有没有人有这个想法? Thanks!
谢谢!
+
必须被反击以获得其特殊含义。
echo "12 cats" | sed 's/[0-9]\+/Number/g'
Expanding the +
modifier works for me: 扩展
+
修饰符对我有用:
echo "12 cats" | sed 's/[0-9][0-9]*/Number/g'
Also, the -E
switch would make the +
modifier work, see choroba's answer. 此外,
-E
开关会使+
修饰符起作用,请参阅choroba的答案。
使用perl,这将适用于unix或linux。
echo "12 cats" | perl -pe 's/\d+/Number/g'
In a very mystic way that is not explained (at least in resources I have so far..), You should check up the next terms: 以非常神秘的方式解释(至少在我到目前为止的资源中......),你应该检查下一个术语:
globbing (in the context of bash), regex, extended regex globbing(在bash的上下文中),正则表达式,扩展的正则表达式
For your question it seems that the expr' you gave to sed is a regex or extended regex....so by a tutorial I read you should insert also the -r before your actual command in sed... 对于你的问题,似乎你给sed的expr是一个正则表达式或扩展的正则表达式....所以通过我读过的教程你应该在sed中的实际命令之前插入-r ...
echo "12 cats" | 回声“12只猫”| sed -r 's/[0-9]+/Number/g'
sed -r's / [0-9] + / Number / g'
Works for me in an Ubuntu 16.04 , bash. 在Ubuntu 16.04中为我工作,bash。
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