为什么BASH_REMATCH不是引用的正规前pression工作？ [英] Why does BASH_REMATCH not work for a quoted regular expression?

问题描述

在code是这样的：

#!/bin/bash
if [[ foobarbletch =~ 'foo(bar)bl(.*)' ]]
 then
     echo "The regex matches!"
     echo $BASH_REMATCH
     echo ${BASH_REMATCH[1]}
     echo ${BASH_REMATCH[2]}
 fi

当我尝试运行它，它不会显示任何内容：

When I try to run it, it doesn't display anything:

bash-3.2$ bash --version
GNU bash, version 3.2.48(1)-release (x86_64-apple-darwin12)
Copyright (C) 2007 Free Software Foundation, Inc.
bash-3.2$ /bin/bash test_rematch.bash
bash-3.2$ 

有没有人有这个想法？谢谢！

Does anyone have ideas about this? Thanks!

推荐答案

在您的bash的正则表达式，你应该删除引号。这就是为什么不起作用。

In your bash REGEX, you should remove quotes. That's why that doesn't work.

如果你有空间，我建议使用这种方式：

If you have space, I recommend to use this way :

#!/bin/bash
x='foo bar bletch'
if [[ $x =~ foo[[:space:]](bar)[[:space:]]bl(.*) ]]
then
    echo The regex matches!
    echo $BASH_REMATCH      
    echo ${BASH_REMATCH[1]} 
    echo ${BASH_REMATCH[2]} 
fi

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