bash 中的不等号波浪号
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The Not Equal Tilde in bash
提问by Armageddon
Like presented in the title,
What's the oppositeof "=~"operator?
I really googled for that and I fund just the following solution: [[ ! $str1 =~ $str2 ]]Is there any operator that verify the oppositeof "=~"operator?
如标题所示，operator的反义词是什么？我真的一派为我刚才的基金以下解决方案：
是否有任何操作员核实相反的操作？"=~"[[ ! $str1 =~ $str2 ]]"=~"
Thanks.
谢谢。
采纳答案by DevSolar
There is no opposing operator in bash up to version 4.3 (current at the time of this post).
在 bash 版本 4.3 之前没有反对的运算符（在本文发布时是最新的）。
[[ ! str1 =~ str2 ]]is the way to go.
[[ ! str1 =~ str2 ]]是要走的路。
For such questions, you should use maninstead of your favourite search engine. The man page of the tool involved -- bash, in this case -- is authoritative, the 'web is hearsay (unless, of course, it led you to the man page ;-) ).
对于此类问题，您应该使用man而不是您最喜欢的搜索引擎。所涉及的工具的手册页——在这种情况下是 bash——是权威的，'web 是道听途说的（当然，除非它把你带到了手册页 ;-) ）。
回答by PradyJord
Answer is There is no such Operator in bashWhich does !~as its there in perl, if you do not want to use already known ( [[ ! $str1 =~ $str2 ]] )for the purpose then you shall have to use grepor perl. Something like:
答案是在 bash 中没有这样的运算符，!~它在 perl 中的作用与它一样，如果您不想( [[ ! $str1 =~ $str2 ]] )为此目的使用已知的，那么您必须使用grep或perl。就像是：
x="I like negation"
y="like"
if [[ $(perl -ne "!/$y/ && print" <(echo $x)) == "$x" ]]; then
echo "Contains"
else
echo "Doesn't contain"
But I don't find any reason to miss !~in bash as [[ ! $str1 =~ $str2 ]]solves the purpose pretty well. May be that the reason its not there in bash.
但是我没有找到任何理由!~在 bash 中错过，因为它[[ ! $str1 =~ $str2 ]]很好地解决了这个目的。可能是因为它不在 bash 中。
Consider the first comment on this Answer from DevSolar, It holds when you will go with grepor perl, which again makes [[ ! $str1 =~ $str2 ]]the best out of available.
考虑一下 DevSolar 对此答案的第一条评论，它适用于您何时使用grep或perl，这再次使[[ ! $str1 =~ $str2 ]]最好的可用。
