GNU M4：定义一个匹配文本的规则，并对匹配的文本进行操作？
GNU M4: Define a rule that matches text, and operates on that matched text?
假设我有：
File:
[x]
我想定义 m4 宏：
define(`\[.*\]`, ...)
问题：这可能吗？如何做到？
这是不可能的，正如您在 manual of m4 中看到的那样：
3.1 Macro names
A name is any sequence of letters, digits, and the character ‘_’
(underscore), where the first character is not a digit. m4 will use
the longest such sequence found in the input. If a name has a macro
definition, it will be subject to macro expansion (see Macros). Names
are case-sensitive.
Examples of legal names are: ‘foo’, ‘_tmp’, and ‘name01’.
[ 和 ] 字符在宏定义中不合法。
如果你喜欢冒险，也许你可以看看 GNU m4 1.4.18 的信息页面中提到的这个实验性功能：
An experimental feature, which would improve 'm4' usefulness, allows
for changing the syntax for what is a "word" in 'm4'. You should use:
./configure --enable-changeword
if you want this feature compiled in. The current implementation slows
down 'm4' considerably and is hardly acceptable. In the future, 'm4'
2.0 will come with a different set of new features that provide similar
capabilities, but without the inefficiencies, so changeword will go away
and _you should not count on it_.
假设我有：
File:
[x]
我想定义 m4 宏：
define(`\[.*\]`, ...)
问题：这可能吗？如何做到？
这是不可能的，正如您在 manual of m4 中看到的那样：
3.1 Macro names
A name is any sequence of letters, digits, and the character ‘_’ (underscore), where the first character is not a digit. m4 will use the longest such sequence found in the input. If a name has a macro definition, it will be subject to macro expansion (see Macros). Names are case-sensitive.
Examples of legal names are: ‘foo’, ‘_tmp’, and ‘name01’.
[ 和 ] 字符在宏定义中不合法。
如果你喜欢冒险，也许你可以看看 GNU m4 1.4.18 的信息页面中提到的这个实验性功能：
An experimental feature, which would improve 'm4' usefulness, allows
for changing the syntax for what is a "word" in 'm4'. You should use:
./configure --enable-changeword
if you want this feature compiled in. The current implementation slows
down 'm4' considerably and is hardly acceptable. In the future, 'm4'
2.0 will come with a different set of new features that provide similar
capabilities, but without the inefficiencies, so changeword will go away
and _you should not count on it_.