问题
Suppose I have:
File:
[x]
And I would like to define m4 macro:
define(`\[.*\]`, ...)
Question: Is this possible and how does one do it?
回答1:
It isn't possible as you can see in manual of m4:
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’.
The [ and ] characters aren't legal in macro definition.
来源：https://stackoverflow.com/questions/57206281/gnu-m4-define-a-rule-that-matches-text-and-operates-on-that-matched-text