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14.5.1.1 Emacs Syntax Tables

A syntax table is an array indexed by the characters in your character set. In the ASCII encoding, therefore, a syntax table has 256 elements.

If Regex is compiled with the preprocessor symbol emacs defined, then Regex expects you to define and initialize the variable re_syntax_table to be an Emacs syntax table. Emacs' syntax tables are more complicated than Regex's own (see Non-Emacs Syntax Tables). See Syntax, for a description of Emacs' syntax tables.