Changing Emacs Forward-Word Behaviour

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Try:

(require 'misc)

Then use M-x forward-to-word and see if it does what you want. You can then rebind M-f, etc.

To make the _ not a word separator (i.e. make it a word constituent) for C & C++ mode, you would do this:

(modify-syntax-entry ?_ "w" c-mode-syntax-table)
(modify-syntax-entry ?_ "w" c++-mode-syntax-table)

For more information on syntax tables, read this wiki page. Syntax tables are generally named like tex-mode-syntax-table and cperl-mode-syntax-table.

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