Next: Quoted strings, Up: Syntax
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'.